v3.25.4
Risk Management - Disclosure of analysis of credit risk profile by internal PD band for loans and advances at amortised cost, contingent liabilities and loan commitments (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of internal credit grades [line items]      
Credit exposure £ 1,232,975 £ 1,204,773  
ECL coverage 100.00%    
Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 25,567 £ 25,393  
ECL coverage 0.60% 0.70%  
Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 333,859 £ 338,191  
ECL coverage 0.10% 0.10%  
100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 93 £ 479  
ECL coverage 19.80% 3.20%  
100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 555 £ 472  
ECL coverage 1.80% 1.90%  
Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 10,095 £ 9,659  
ECL coverage 0.00% 0.00%  
Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 90,923 £ 86,454  
ECL coverage 0.00% 0.00%  
Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 4,096 £ 4,932  
ECL coverage 0.00% 0.00%  
Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 76,184 £ 68,492  
ECL coverage 0.00% 0.00%  
Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 3,648 £ 3,106  
ECL coverage 0.10% 0.10%  
Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 50,839 £ 57,831  
ECL coverage 0.00% 0.00%  
Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 2,114 £ 2,292  
ECL coverage 0.10% 0.20%  
Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 50,047 £ 55,292  
ECL coverage 0.00% 0.00%  
Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 2,988 £ 2,853  
ECL coverage 0.50% 0.70%  
Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 44,139 £ 48,085  
ECL coverage 0.10% 0.10%  
Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 1,822 £ 1,610  
ECL coverage 1.70% 3.40%  
Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 17,217 £ 17,573  
ECL coverage 0.40% 0.50%  
Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 711 £ 462  
ECL coverage 10.60% 15.10%  
Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 3,955 £ 3,992  
ECL coverage 1.70% 1.40%  
Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure £ 150,786 £ 144,827  
ECL coverage 2.30% 2.30%  
Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 2,389 £ 2,037  
ECL coverage 45.90% 47.80%  
Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 45,416 £ 43,438  
ECL coverage 0.20% 0.00%  
Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 24,363 £ 22,658  
ECL coverage 0.00% 0.00%  
Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 15,737 £ 14,524  
ECL coverage 0.10% 0.10%  
Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 27,352 £ 27,933  
ECL coverage 0.20% 0.20%  
Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 20,975 £ 17,983  
ECL coverage 0.70% 0.60%  
Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 11,857 £ 13,629  
ECL coverage 4.40% 4.60%  
Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 2,697 £ 2,625  
ECL coverage 21.50% 21.10%  
Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure £ 4,952 £ 4,956  
ECL coverage 0.70% 0.80%  
Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 151 £ 278  
ECL coverage 13.70% 10.30%  
Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 0 £ 0  
ECL coverage 0.00% 0.00%  
Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 0 £ 4  
ECL coverage 0.00% 0.00%  
Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 7 £ 2  
ECL coverage 0.00% 0.00%  
Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 4,655 £ 4,518  
ECL coverage 0.20% 0.20%  
Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 3 £ 5  
ECL coverage 0.00% 0.00%  
Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 135 £ 148  
ECL coverage 0.00% 0.70%  
Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 1 £ 1  
ECL coverage 0.00% 0.00%  
Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure £ 20,527 £ 19,749  
ECL coverage 11.20% 11.50%  
Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 381 £ 308  
ECL coverage 78.50% 82.10%  
Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 1,190 £ 1  
ECL coverage 5.00% 0.00%  
Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 579 £ 564  
ECL coverage 0.20% 0.20%  
Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 1,465 £ 2,557  
ECL coverage 0.20% 0.30%  
Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 2,699 £ 4,366  
ECL coverage 0.40% 0.50%  
Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 6,055 £ 2,976  
ECL coverage 1.30% 1.50%  
Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 7,086 £ 8,087  
ECL coverage 5.70% 5.90%  
Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 1,072 £ 890  
ECL coverage 36.20% 38.50%  
Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure £ 4,128 £ 3,918  
ECL coverage 0.80% 0.80%  
Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 87 £ 191  
ECL coverage 18.70% 11.60%  
Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 0 £ 0  
ECL coverage 0.00% 0.00%  
Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 12 £ 6  
ECL coverage 0.00% 0.00%  
Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 33 £ 17  
ECL coverage 0.00% 0.00%  
Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 3,560 £ 3,194  
ECL coverage 0.10% 0.20%  
Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 109 £ 66  
ECL coverage 1.80% 0.00%  
Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 315 £ 437  
ECL coverage 0.90% 0.00%  
Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 12 £ 7  
ECL coverage 20.00% 12.50%  
Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure £ 121,179 £ 116,204  
ECL coverage 0.80% 0.70%  
Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 1,770 £ 1,260  
ECL coverage 25.00% 23.70%  
Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 44,226 £ 43,437  
ECL coverage 0.00% 0.00%  
Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 23,772 £ 22,084  
ECL coverage 0.00% 0.00%  
Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 14,232 £ 11,948  
ECL coverage 0.10% 0.10%  
Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 16,438 £ 15,855  
ECL coverage 0.20% 0.10%  
Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 14,808 £ 14,936  
ECL coverage 0.50% 0.50%  
Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 4,321 £ 4,957  
ECL coverage 2.50% 2.70%  
Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 1,612 £ 1,727  
ECL coverage 7.50% 7.80%  
Gross exposure | Net gains on financial instruments designated at fair value      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts £ 22,197 £ 16,338  
Gross exposure | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure 4,985 4,997 £ 8,362
Gross exposure | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure 23,113 22,306 27,287
Gross exposure | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure 4,160 3,949 3,411
Gross exposure | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure 122,145 116,995 111,158
Gross exposure | ECL | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 25,728 25,577  
Gross exposure | ECL | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 334,096 338,427  
Gross exposure | ECL | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 116 495  
Gross exposure | ECL | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 565 481  
Gross exposure | ECL | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 10,096 9,661  
Gross exposure | ECL | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 90,927 86,457  
Gross exposure | ECL | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 4,098 4,934  
Gross exposure | ECL | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 76,190 68,500  
Gross exposure | ECL | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 3,650 3,108  
Gross exposure | ECL | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 50,845 57,844  
Gross exposure | ECL | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 2,117 2,296  
Gross exposure | ECL | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 50,054 55,312  
Gross exposure | ECL | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 3,003 2,872  
Gross exposure | ECL | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 44,200 48,127  
Gross exposure | ECL | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 1,853 1,667  
Gross exposure | ECL | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 17,292 17,657  
Gross exposure | ECL | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 795 544  
Gross exposure | ECL | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 4,023 4,049  
Gross exposure | ECL | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure 154,403 148,247  
Gross exposure | ECL | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 4,418 3,901  
Gross exposure | ECL | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 45,488 43,444  
Gross exposure | ECL | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 24,370 22,667  
Gross exposure | ECL | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 15,756 14,541  
Gross exposure | ECL | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 27,405 27,988  
Gross exposure | ECL | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 21,132 18,098  
Gross exposure | ECL | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 12,397 14,279  
Gross exposure | ECL | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 3,437 3,329  
Gross exposure | ECL | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure 4,985 4,997  
Gross exposure | ECL | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 175 310  
Gross exposure | ECL | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | ECL | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 4  
Gross exposure | ECL | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 7 2  
Gross exposure | ECL | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 4,664 4,526  
Gross exposure | ECL | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 3 5  
Gross exposure | ECL | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 135 149  
Gross exposure | ECL | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1 1  
Gross exposure | ECL | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure 23,113 22,306  
Gross exposure | ECL | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,776 1,724  
Gross exposure | ECL | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,253 1  
Gross exposure | ECL | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 580 565  
Gross exposure | ECL | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,468 2,564  
Gross exposure | ECL | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,711 4,388  
Gross exposure | ECL | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 6,133 3,022  
Gross exposure | ECL | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 7,513 8,596  
Gross exposure | ECL | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,679 1,446  
Gross exposure | ECL | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure 4,160 3,949  
Gross exposure | ECL | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 107 216  
Gross exposure | ECL | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | ECL | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 12 6  
Gross exposure | ECL | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 33 17  
Gross exposure | ECL | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 3,564 3,199  
Gross exposure | ECL | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 111 66  
Gross exposure | ECL | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 318 437  
Gross exposure | ECL | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 15 8  
Gross exposure | ECL | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure 122,145 116,995  
Gross exposure | ECL | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,360 1,651  
Gross exposure | ECL | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 44,235 43,443  
Gross exposure | ECL | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 23,778 22,092  
Gross exposure | ECL | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 14,248 11,958  
Gross exposure | ECL | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 16,466 15,875  
Gross exposure | ECL | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 14,885 15,005  
Gross exposure | ECL | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 4,431 5,097  
Gross exposure | ECL | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,742 1,874  
Gross exposure | Stage 1 | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 23,707 22,247  
Gross exposure | Stage 1 | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 321,118 323,951  
Gross exposure | Stage 1 | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Stage 1 | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Stage 1 | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 10,096 9,351  
Gross exposure | Stage 1 | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 90,723 86,137  
Gross exposure | Stage 1 | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 3,920 4,934  
Gross exposure | Stage 1 | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 75,414 68,407  
Gross exposure | Stage 1 | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 3,645 2,717  
Gross exposure | Stage 1 | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 50,189 56,893  
Gross exposure | Stage 1 | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 2,025 2,177  
Gross exposure | Stage 1 | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 49,560 54,576  
Gross exposure | Stage 1 | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 2,773 2,309  
Gross exposure | Stage 1 | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 41,798 45,417  
Gross exposure | Stage 1 | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 1,163 730  
Gross exposure | Stage 1 | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 12,874 11,878  
Gross exposure | Stage 1 | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 85 29  
Gross exposure | Stage 1 | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 560 643  
Gross exposure | Stage 1 | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure 138,892 132,689  
Gross exposure | Stage 1 | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 45,048 43,319  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 24,330 22,522  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 15,362 13,973  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 26,853 27,658  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 18,362 14,991  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 8,504 9,914  
Gross exposure | Stage 1 | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 433 312  
Gross exposure | Stage 1 | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure 4,674 4,537 7,257
Gross exposure | Stage 1 | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 4  
Gross exposure | Stage 1 | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 7 2  
Gross exposure | Stage 1 | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 4,664 4,526  
Gross exposure | Stage 1 | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 2 4  
Gross exposure | Stage 1 | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 1 1  
Gross exposure | Stage 1 | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure 18,801 17,629 22,315
Gross exposure | Stage 1 | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,216 1  
Gross exposure | Stage 1 | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 580 565  
Gross exposure | Stage 1 | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,468 2,562  
Gross exposure | Stage 1 | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,710 4,384  
Gross exposure | Stage 1 | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 6,091 2,905  
Gross exposure | Stage 1 | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 6,414 7,018  
Gross exposure | Stage 1 | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 322 194  
Gross exposure | Stage 1 | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure 3,788 3,329 2,734
Gross exposure | Stage 1 | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 12 6  
Gross exposure | Stage 1 | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 33 17  
Gross exposure | Stage 1 | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 3,564 3,199  
Gross exposure | Stage 1 | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 109 65  
Gross exposure | Stage 1 | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 69 41  
Gross exposure | Stage 1 | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1 1  
Gross exposure | Stage 1 | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure 111,629 107,194 100,956
Gross exposure | Stage 1 | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Stage 1 | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 43,832 43,318  
Gross exposure | Stage 1 | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 23,738 21,947  
Gross exposure | Stage 1 | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 13,854 11,392  
Gross exposure | Stage 1 | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 15,915 15,549  
Gross exposure | Stage 1 | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 12,160 12,017  
Gross exposure | Stage 1 | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,020 2,854  
Gross exposure | Stage 1 | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 110 117  
Gross exposure | Lifetime expected credit losses | Stage 2 | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 1,905 2,835  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 12,413 13,995  
Gross exposure | Lifetime expected credit losses | Stage 2 | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 310  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 204 320  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 178 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 776 93  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 5 391  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 656 951  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 92 119  
Gross exposure | Lifetime expected credit losses | Stage 2 | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 494 736  
Gross exposure | Lifetime expected credit losses | Stage 2 | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 230 563  
Gross exposure | Lifetime expected credit losses | Stage 2 | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 2,402 2,710  
Gross exposure | Lifetime expected credit losses | Stage 2 | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 690 937  
Gross exposure | Lifetime expected credit losses | Stage 2 | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 4,418 5,779  
Gross exposure | Lifetime expected credit losses | Stage 2 | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 710 515  
Gross exposure | Lifetime expected credit losses | Stage 2 | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 3,463 3,406  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure 11,093 11,654  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 440 122  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 40 145  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 394 568  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 552 330  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,770 3,107  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 3,893 4,365  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 3,004 3,017  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure 136 150 389
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 1 1  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 134 148  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1 1  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure 2,536 2,953 3,450
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 37 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 2  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 1 4  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 42 117  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,099 1,578  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,357 1,252  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure 265 404 369
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 2 1  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 249 396  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 14 7  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure 8,156 8,147 8,967
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 403 122  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 40 145  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 394 566  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 551 326  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,725 2,988  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,411 2,243  
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,632 1,757  
Gross exposure | Lifetime expected credit losses | Stage 3 | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 116 495  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 565 481  
Gross exposure | Lifetime expected credit losses | Stage 3 | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 116 495  
Gross exposure | Lifetime expected credit losses | Stage 3 | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 565 481  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure 4,418 3,904  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 4,418 3,901  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 3  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure 175 310 716
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 175 310  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure 1,776 1,724 1,522
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 1,776 1,724  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure 107 216 308
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 107 216  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure 2,360 1,654 1,235
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 2,360 1,651  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 3  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment      
Disclosure of internal credit grades [line items]      
Credit exposure (4,034) (3,860)  
Accumulated impairment | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure (33) (41) (360)
Accumulated impairment | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure (2,586) (2,557) (2,776)
Accumulated impairment | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure (32) (31) (45)
Accumulated impairment | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure (966) (791) (836)
Accumulated impairment | ECL | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (161) (184)  
Accumulated impairment | ECL | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (237) (236)  
Accumulated impairment | ECL | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (23) (16)  
Accumulated impairment | ECL | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (10) (9)  
Accumulated impairment | ECL | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (1) (2)  
Accumulated impairment | ECL | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (4) (3)  
Accumulated impairment | ECL | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (2) (2)  
Accumulated impairment | ECL | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (6) (8)  
Accumulated impairment | ECL | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (2) (2)  
Accumulated impairment | ECL | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (6) (13)  
Accumulated impairment | ECL | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (3) (4)  
Accumulated impairment | ECL | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (7) (20)  
Accumulated impairment | ECL | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (15) (19)  
Accumulated impairment | ECL | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (61) (42)  
Accumulated impairment | ECL | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (31) (57)  
Accumulated impairment | ECL | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (75) (84)  
Accumulated impairment | ECL | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (84) (82)  
Accumulated impairment | ECL | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (68) (57)  
Accumulated impairment | ECL | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure (3,617) (3,420)  
Accumulated impairment | ECL | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (2,029) (1,864)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (72) (6)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (7) (9)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (19) (17)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (53) (55)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (157) (115)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (540) (650)  
Accumulated impairment | ECL | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (740) (704)  
Accumulated impairment | ECL | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure (33) (41)  
Accumulated impairment | ECL | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (24) (32)  
Accumulated impairment | ECL | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (9) (8)  
Accumulated impairment | ECL | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 (1)  
Accumulated impairment | ECL | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure (2,586) (2,557)  
Accumulated impairment | ECL | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (1,395) (1,416)  
Accumulated impairment | ECL | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (63) 0  
Accumulated impairment | ECL | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (1) (1)  
Accumulated impairment | ECL | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (3) (7)  
Accumulated impairment | ECL | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (12) (22)  
Accumulated impairment | ECL | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (78) (46)  
Accumulated impairment | ECL | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (427) (509)  
Accumulated impairment | ECL | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (607) (556)  
Accumulated impairment | ECL | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure (32) (31)  
Accumulated impairment | ECL | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (20) (25)  
Accumulated impairment | ECL | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | ECL | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (4) (5)  
Accumulated impairment | ECL | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (2) 0  
Accumulated impairment | ECL | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (3) 0  
Accumulated impairment | ECL | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (3) (1)  
Accumulated impairment | ECL | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure (966) (791)  
Accumulated impairment | ECL | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (590) (391)  
Accumulated impairment | ECL | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (9) (6)  
Accumulated impairment | ECL | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (6) (8)  
Accumulated impairment | ECL | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (16) (10)  
Accumulated impairment | ECL | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (28) (20)  
Accumulated impairment | ECL | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (77) (69)  
Accumulated impairment | ECL | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (110) (140)  
Accumulated impairment | ECL | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (130) (147)  
Accumulated impairment | Stage 1 | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (36) (42)  
Accumulated impairment | Stage 1 | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (95) (113)  
Accumulated impairment | Stage 1 | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Stage 1 | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Stage 1 | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (1) (1)  
Accumulated impairment | Stage 1 | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (4) (3)  
Accumulated impairment | Stage 1 | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (2) (2)  
Accumulated impairment | Stage 1 | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (6) (8)  
Accumulated impairment | Stage 1 | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (2) (2)  
Accumulated impairment | Stage 1 | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (6) (12)  
Accumulated impairment | Stage 1 | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (3) (4)  
Accumulated impairment | Stage 1 | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (7) (19)  
Accumulated impairment | Stage 1 | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (12) (12)  
Accumulated impairment | Stage 1 | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (34) (31)  
Accumulated impairment | Stage 1 | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (15) (21)  
Accumulated impairment | Stage 1 | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (35) (39)  
Accumulated impairment | Stage 1 | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (1) 0  
Accumulated impairment | Stage 1 | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (3) (1)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure (552) (491)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (44) (4)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (7) (9)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (15) (15)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (52) (53)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (123) (86)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (272) (292)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (39) (32)  
Accumulated impairment | Stage 1 | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure (9) (8) (11)
Accumulated impairment | Stage 1 | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (9) (8)  
Accumulated impairment | Stage 1 | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure (395) (334) (412)
Accumulated impairment | Stage 1 | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (40) 0  
Accumulated impairment | Stage 1 | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (1) (1)  
Accumulated impairment | Stage 1 | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (3) (7)  
Accumulated impairment | Stage 1 | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (12) (22)  
Accumulated impairment | Stage 1 | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (74) (37)  
Accumulated impairment | Stage 1 | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (231) (242)  
Accumulated impairment | Stage 1 | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (34) (25)  
Accumulated impairment | Stage 1 | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure (7) (5) (8)
Accumulated impairment | Stage 1 | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (4) (5)  
Accumulated impairment | Stage 1 | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (2) 0  
Accumulated impairment | Stage 1 | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (1) 0  
Accumulated impairment | Stage 1 | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure (141) (144) (179)
Accumulated impairment | Stage 1 | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Stage 1 | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (4) (4)  
Accumulated impairment | Stage 1 | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (6) (8)  
Accumulated impairment | Stage 1 | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (12) (8)  
Accumulated impairment | Stage 1 | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (27) (18)  
Accumulated impairment | Stage 1 | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (47) (49)  
Accumulated impairment | Stage 1 | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (40) (50)  
Accumulated impairment | Stage 1 | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (5) (7)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (102) (126)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (132) (114)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (3) (7)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (27) (11)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (16) (36)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (40) (45)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (83) (82)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (65) (56)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure (1,036) (1,063)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (28) 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (4) (2)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (1) (2)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (34) (29)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (268) (358)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (701) (672)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure 0 (1) (28)
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure (796) (807) (1,138)
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (23) 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (4) (9)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (196) (267)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (573) (531)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure (5) (1) (2)
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (2) 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (3) (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure (235) (254) (309)
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure (5) 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure (4) (2)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure (1) (2)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure (30) (20)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure (70) (90)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (125) (140)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (23) (16)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (10) (9)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (23) (16)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts (10) (9)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.0 to 0.05% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.0 to 0.05% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.05 to 0.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.05 to 0.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.15 to 0.30% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.15 to 0.30% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.30 to 0.60% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Strong | 0.30 to 0.60% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Satisfactory | 0.60 to 2.15% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Satisfactory | 0.60 to 2.15% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Satisfactory | 2.15 to 11.35% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Satisfactory | 2.15 to 11.35% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Higher Risk | 11.35% to 100% | Contingent liabilities      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Higher Risk | 11.35% to 100% | Loan commitments      
Disclosure of internal credit grades [line items]      
Exposure to credit risk on loan commitments and financial guarantee contracts 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost      
Disclosure of internal credit grades [line items]      
Credit exposure (2,029) (1,866)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (2,029) (1,864)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 (2)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages      
Disclosure of internal credit grades [line items]      
Credit exposure (24) (32) (321)
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (24) (32)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards      
Disclosure of internal credit grades [line items]      
Credit exposure (1,395) (1,416) (1,226)
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (1,395) (1,416)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other      
Disclosure of internal credit grades [line items]      
Credit exposure (20) (25) (35)
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (20) (25)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans      
Disclosure of internal credit grades [line items]      
Credit exposure (590) (393) £ (348)
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | 100%      
Disclosure of internal credit grades [line items]      
Credit exposure (590) (391)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.0 to 0.05%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 (2)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.05 to 0.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.15 to 0.30%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Strong | 0.30 to 0.60%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Satisfactory | 0.60 to 2.15%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Satisfactory | 2.15 to 11.35%      
Disclosure of internal credit grades [line items]      
Credit exposure 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans | Higher Risk | 11.35% to 100%      
Disclosure of internal credit grades [line items]      
Credit exposure £ 0 £ 0