v3.25.4
Risk Management - Disclosure of credit exposures by internal PD grade of assets held for sale (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,232,975 £ 1,204,773  
Expected credit loss rate 100.00%    
Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ (4,034) (3,860)  
Retail credit cards      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 20,527 £ 19,749  
Expected credit loss rate 11.20% 11.50%  
Retail credit cards | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 381 £ 308  
Expected credit loss rate 78.50% 82.10%  
Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,190 £ 1  
Expected credit loss rate 5.00% 0.00%  
Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 579 £ 564  
Expected credit loss rate 0.20% 0.20%  
Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,465 £ 2,557  
Expected credit loss rate 0.20% 0.30%  
Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 2,699 £ 4,366  
Expected credit loss rate 0.40% 0.50%  
Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 6,055 £ 2,976  
Expected credit loss rate 1.30% 1.50%  
Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 7,086 £ 8,087  
Expected credit loss rate 5.70% 5.90%  
Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,072 £ 890  
Expected credit loss rate 36.20% 38.50%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 5,755 £ 5,970  
Expected credit loss rate 3.90% 4.30%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 10 £ 11  
Expected credit loss rate 81.50% 80.70%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 0.00%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 165 £ 0  
Expected credit loss rate 0.00% 0.00%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 950 £ 0  
Expected credit loss rate 0.30% 0.00%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,346 £ 0  
Expected credit loss rate 0.40% 0.00%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,782 £ 5,431  
Expected credit loss rate 1.00% 1.20%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,306 £ 528  
Expected credit loss rate 5.00% 23.40%  
Retail credit cards | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 196 £ 0  
Expected credit loss rate 32.20% 0.00%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 2,192  
Expected credit loss rate 0.00% 5.00%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 24  
Expected credit loss rate 0.00% 74.20%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 62  
Expected credit loss rate 0.00% 0.00%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 288  
Expected credit loss rate 0.00% 0.30%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 151  
Expected credit loss rate 0.00% 0.70%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 249  
Expected credit loss rate 0.00% 0.40%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 924  
Expected credit loss rate 0.00% 1.00%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 435  
Expected credit loss rate 0.00% 4.60%  
Retail credit cards | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 59  
Expected credit loss rate 0.00% 19.20%  
Retail credit cards | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 23,113 £ 22,306 £ 27,287
Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 5,988 6,241  
Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 2,308  
Retail credit cards | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2,586) (2,557) (2,776)
Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (233) (271)  
Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (116)  
Retail other      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 4,128 £ 3,918  
Expected credit loss rate 0.80% 0.80%  
Retail other | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 87 £ 191  
Expected credit loss rate 18.70% 11.60%  
Retail other | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 0.00%  
Retail other | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 12 £ 6  
Expected credit loss rate 0.00% 0.00%  
Retail other | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 33 £ 17  
Expected credit loss rate 0.00% 0.00%  
Retail other | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 3,560 £ 3,194  
Expected credit loss rate 0.10% 0.20%  
Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 109 £ 66  
Expected credit loss rate 1.80% 0.00%  
Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 315 £ 437  
Expected credit loss rate 0.90% 0.00%  
Retail other | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 12 £ 7  
Expected credit loss rate 20.00% 12.50%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 1,328  
Expected credit loss rate 0.00% 6.80%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 23  
Expected credit loss rate 0.00% 67.60%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 1  
Expected credit loss rate 0.00% 0.00%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 25  
Expected credit loss rate 0.00% 0.00%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 110  
Expected credit loss rate 0.00% 0.00%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 293  
Expected credit loss rate 0.00% 0.30%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 541  
Expected credit loss rate 0.00% 1.80%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 321  
Expected credit loss rate 0.00% 8.80%  
Retail other | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 14  
Expected credit loss rate 0.00% 33.30%  
Retail other | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 4,160 £ 3,949 3,411
Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1,425  
Retail other | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (32) (31) (45)
Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (97)  
Corporate loans      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 121,179 £ 116,204  
Expected credit loss rate 0.80% 0.70%  
Corporate loans | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,770 £ 1,260  
Expected credit loss rate 25.00% 23.70%  
Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 44,226 £ 43,437  
Expected credit loss rate 0.00% 0.00%  
Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 23,772 £ 22,084  
Expected credit loss rate 0.00% 0.00%  
Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 14,232 £ 11,948  
Expected credit loss rate 0.10% 0.10%  
Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 16,438 £ 15,855  
Expected credit loss rate 0.20% 0.10%  
Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 14,808 £ 14,936  
Expected credit loss rate 0.50% 0.50%  
Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 4,321 £ 4,957  
Expected credit loss rate 2.50% 2.70%  
Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 1,612 £ 1,727  
Expected credit loss rate 7.50% 7.80%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 46 £ 54  
Expected credit loss rate 6.10% 8.50%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 100.00%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 0.00%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 0.00%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 0.00%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0  
Expected credit loss rate 0.00% 0.00%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 2 £ 48  
Expected credit loss rate 0.00% 2.00%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 40 £ 6  
Expected credit loss rate 2.40% 33.30%  
Corporate loans | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 4 £ 0  
Expected credit loss rate 33.30% 0.00%  
Corporate loans | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 122,145 £ 116,995 111,158
Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 49 59  
Corporate loans | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (966) (791) (836)
Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) (5)  
ECL | Retail credit cards | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 23,113 22,306  
ECL | Retail credit cards | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,776 1,724  
ECL | Retail credit cards | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,253 1  
ECL | Retail credit cards | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 580 565  
ECL | Retail credit cards | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,468 2,564  
ECL | Retail credit cards | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,711 4,388  
ECL | Retail credit cards | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 6,133 3,022  
ECL | Retail credit cards | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 7,513 8,596  
ECL | Retail credit cards | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,679 1,446  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 5,988 6,241  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 54 57  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 165 0  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 953 0  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,352 0  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,800 5,495  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,375 689  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 289 0  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 2,308  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 93  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 62  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 289  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 152  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 250  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 933  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 456  
ECL | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 73  
ECL | Retail credit cards | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2,586) (2,557)  
ECL | Retail credit cards | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1,395) (1,416)  
ECL | Retail credit cards | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (63) 0  
ECL | Retail credit cards | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) (1)  
ECL | Retail credit cards | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) (7)  
ECL | Retail credit cards | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (12) (22)  
ECL | Retail credit cards | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (78) (46)  
ECL | Retail credit cards | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (427) (509)  
ECL | Retail credit cards | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (607) (556)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (233) (271)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (44) (46)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) 0  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (6) 0  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (18) (64)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (69) (161)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (93) 0  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (116)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (69)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (9)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (21)  
ECL | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (14)  
ECL | Retail other | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 4,160 3,949  
ECL | Retail other | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 107 216  
ECL | Retail other | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 12 6  
ECL | Retail other | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 33 17  
ECL | Retail other | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 3,564 3,199  
ECL | Retail other | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 111 66  
ECL | Retail other | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 318 437  
ECL | Retail other | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 15 8  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1,425  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 71  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 25  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 110  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 294  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 551  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 352  
ECL | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 21  
ECL | Retail other | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (32) (31)  
ECL | Retail other | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (20) (25)  
ECL | Retail other | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (4) (5)  
ECL | Retail other | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2) 0  
ECL | Retail other | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) 0  
ECL | Retail other | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) (1)  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (97)  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (48)  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (10)  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (31)  
ECL | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (7)  
ECL | Corporate loans | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 122,145 116,995  
ECL | Corporate loans | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,360 1,651  
ECL | Corporate loans | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 44,235 43,443  
ECL | Corporate loans | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 23,778 22,092  
ECL | Corporate loans | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 14,248 11,958  
ECL | Corporate loans | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 16,466 15,875  
ECL | Corporate loans | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 14,885 15,005  
ECL | Corporate loans | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 4,431 5,097  
ECL | Corporate loans | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,742 1,874  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 49 59  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2 49  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 41 9  
ECL | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 6 0  
ECL | Corporate loans | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (966) (791)  
ECL | Corporate loans | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (590) (391)  
ECL | Corporate loans | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (9) (6)  
ECL | Corporate loans | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (6) (8)  
ECL | Corporate loans | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (16) (10)  
ECL | Corporate loans | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (28) (20)  
ECL | Corporate loans | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (77) (69)  
ECL | Corporate loans | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (110) (140)  
ECL | Corporate loans | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (130) (147)  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) (5)  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) (3)  
ECL | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2) 0  
Stage 1 | Retail credit cards | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 18,801 17,629 22,315
Stage 1 | Retail credit cards | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,216 1  
Stage 1 | Retail credit cards | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 580 565  
Stage 1 | Retail credit cards | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,468 2,562  
Stage 1 | Retail credit cards | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,710 4,384  
Stage 1 | Retail credit cards | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 6,091 2,905  
Stage 1 | Retail credit cards | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 6,414 7,018  
Stage 1 | Retail credit cards | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 322 194  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 5,468 5,495  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 165 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 953 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,351 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,795 5,495  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,149 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 55 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1,908  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 62  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 289  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 152  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 250  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 928  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 227  
Stage 1 | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (395) (334) (412)
Stage 1 | Retail credit cards | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (40) 0  
Stage 1 | Retail credit cards | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) (1)  
Stage 1 | Retail credit cards | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) (7)  
Stage 1 | Retail credit cards | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (12) (22)  
Stage 1 | Retail credit cards | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (74) (37)  
Stage 1 | Retail credit cards | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (231) (242)  
Stage 1 | Retail credit cards | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (34) (25)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (65) (64)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (6) 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (18) (64)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (34) 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (4) 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (18)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (9)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (6)  
Stage 1 | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 3,788 3,329 2,734
Stage 1 | Retail other | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 12 6  
Stage 1 | Retail other | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 33 17  
Stage 1 | Retail other | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 3,564 3,199  
Stage 1 | Retail other | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 109 65  
Stage 1 | Retail other | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 69 41  
Stage 1 | Retail other | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1 1  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1,134  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 25  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 110  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 294  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 534  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 170  
Stage 1 | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (7) (5) (8)
Stage 1 | Retail other | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (4) (5)  
Stage 1 | Retail other | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2) 0  
Stage 1 | Retail other | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) 0  
Stage 1 | Retail other | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (16)  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (6)  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (9)  
Stage 1 | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 111,629 107,194 100,956
Stage 1 | Corporate loans | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 43,832 43,318  
Stage 1 | Corporate loans | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 23,738 21,947  
Stage 1 | Corporate loans | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 13,854 11,392  
Stage 1 | Corporate loans | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 15,915 15,549  
Stage 1 | Corporate loans | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 12,160 12,017  
Stage 1 | Corporate loans | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,020 2,854  
Stage 1 | Corporate loans | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 110 117  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 43 49  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2 49  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 41 0  
Stage 1 | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (141) (144) (179)
Stage 1 | Corporate loans | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (4) (4)  
Stage 1 | Corporate loans | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (6) (8)  
Stage 1 | Corporate loans | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (12) (8)  
Stage 1 | Corporate loans | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (27) (18)  
Stage 1 | Corporate loans | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (47) (49)  
Stage 1 | Corporate loans | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (40) (50)  
Stage 1 | Corporate loans | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (5) (7)  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) (1)  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) 0  
Stage 1 | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,536 2,953 3,450
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 37 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 2  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1 4  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 42 117  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,099 1,578  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,357 1,252  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 466 689  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 5 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 226 689  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 234 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 307  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 5  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 229  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 73  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (796) (807) (1,138)
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (23) 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (4) (9)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (196) (267)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (573) (531)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (124) (161)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (35) (161)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (89) 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (29)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (15)  
Stage 2 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (14)  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 265 404 369
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2 1  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 249 396  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 14 7  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 220  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 17  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 182  
Stage 2 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 21  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (5) (1) (2)
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2) 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (3) (1)  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (33)  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (4)  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (22)  
Stage 2 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (7)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 8,156 8,147 8,967
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 403 122  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 40 145  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 394 566  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 551 326  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,725 2,988  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,411 2,243  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,632 1,757  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 6 9  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 9  
Stage 2 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 6 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (235) (254) (309)
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (5) 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (4) (2)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1) (2)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (30) (20)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (70) (90)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (125) (140)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2) (3)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (3)  
Stage 2 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (2) 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,776 1,724 1,522
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 1,776 1,724  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 54 57  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 54 57  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 93  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 93  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1,395) (1,416) (1,226)
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (1,395) (1,416)  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (44) (46)  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (44) (46)  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (69)  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (69)  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail credit cards | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 107 216 308
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 107 216  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 71  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 71  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Gross exposure | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (20) (25) (35)
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (20) (25)  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (48)  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (48)  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Retail other | Accumulated impairment | Non-current assets/liabilities held for sale | German Consumer Finance portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,360 1,654 1,235
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 2,360 1,651  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 3  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 1  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Gross exposure | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (590) (393) £ (348)
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances (590) (391)  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (2)  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 (1)  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.0 to 0.05%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.05 to 0.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.15 to 0.30%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Strong | 0.30 to 0.60%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 0.60 to 2.15%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Satisfactory | 2.15 to 11.35%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances 0 0  
Stage 3 | Lifetime expected credit losses | Corporate loans | Accumulated impairment | Non-current assets/liabilities held for sale | American Airlines Portfolio | Higher Risk | 11.35% to 100%      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Loans and advances £ 0 £ 0