v3.25.4
Risk Management - Disclosure of movement in gross exposures and impairment allowance including reconciliation of ECL (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Loans and advances at amortised cost      
Opening/Beginning balance £ 1,204,773    
Closing/Ending balance 1,232,975 £ 1,204,773  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Total credit impairment charge for the year 1,866 1,617 £ 1,578
Post write-off recoveries 51 31 17
Financial guarantee contracts      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Recoveries and reimbursements (80) (11)  
Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 144,827    
Closing/Ending balance 150,786 144,827  
Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,956    
Closing/Ending balance 4,952 4,956  
Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 19,749    
Closing/Ending balance 20,527 19,749  
Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,918    
Closing/Ending balance 4,128 3,918  
Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 116,204    
Closing/Ending balance 121,179 116,204  
Loan commitments and financial guarantees      
Loans and advances at amortised cost      
Opening/Beginning balance 364,004    
Closing/Ending balance 359,824 364,004  
Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 144,827    
Write-offs (1,101) (1,221)  
Closing/Ending balance 150,786 144,827  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Post write-off recoveries 38 28  
Net write-offs 1,063 1,193  
Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,956    
Closing/Ending balance 4,952 4,956  
Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 19,749    
Closing/Ending balance 20,527 19,749  
Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,918    
Closing/Ending balance 4,128 3,918  
Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 116,204    
Closing/Ending balance 121,179 116,204  
Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 50,227    
Closing/Ending balance 55,153 50,227  
Stage 1 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 132,198    
Closing/Ending balance 138,340 132,198  
Stage 1 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,529    
Closing/Ending balance 4,665 4,529  
Stage 1 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 17,295    
Closing/Ending balance 18,406 17,295  
Stage 1 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,324    
Closing/Ending balance 3,781 3,324  
Stage 1 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 107,050    
Closing/Ending balance 111,488 107,050  
Stage 1 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 47,068    
Closing/Ending balance 54,791 47,068  
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 10,591    
Closing/Ending balance 10,057 10,591  
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 149    
Closing/Ending balance 136 149  
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 2,146    
Closing/Ending balance 1,740 2,146  
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 403    
Closing/Ending balance 260 403  
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 7,893    
Closing/Ending balance 7,921 7,893  
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 3,159    
Closing/Ending balance 362 3,159  
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 2,038    
Closing/Ending balance 2,389 2,038  
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 278    
Closing/Ending balance 151 278  
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 308    
Closing/Ending balance 381 308  
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 191    
Closing/Ending balance 87 191  
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 1,261    
Closing/Ending balance 1,770 1,261  
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 0    
Closing/Ending balance 0 0  
Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,997 8,362  
Business activity in the year 635 634  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 118 264  
Final repayments (747) (1,024)  
Disposals (10) (3,227)  
Write-offs (8) (12)  
Closing/Ending balance 4,985 4,997 8,362
Gross exposure | Retail mortgages | Italy      
Loans and advances at amortised cost      
Disposals   (3,200)  
Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 22,306 27,287  
Business activity in the year 2,872 1,734  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (763) 1,722  
Final repayments (142) (141)  
Transfers to assets held for sale   (6,241)  
Disposals (308) (1,115)  
Write-offs (852) (940)  
Closing/Ending balance 23,113 22,306 27,287
Gross exposure | Retail credit cards | General Motors      
Loans and advances at amortised cost      
Business activity in the year 1,200    
Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,949 3,411  
Business activity in the year 1,179 1,159  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 1,357 1,750  
Final repayments (2,318) (2,357)  
Disposals 0 0  
Write-offs (7) (14)  
Closing/Ending balance 4,160 3,949 3,411
Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 116,995 111,158  
Business activity in the year 29,467 29,491  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 4,880 4,161  
Final repayments (28,839) (27,485)  
Transfers to assets held for sale   (59)  
Disposals (124) (16)  
Write-offs (234) (255)  
Closing/Ending balance 122,145 116,995 111,158
Gross exposure | Corporate loans | General Motors      
Loans and advances at amortised cost      
Business activity in the year 100    
Gross exposure | Other financial assets      
Loans and advances at amortised cost      
Opening/Beginning balance 169,600    
Closing/Ending balance 186,100 169,600  
Gross exposure | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Debt securities at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Disposals   (200)  
Gross exposure | Debt securities at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Disposals 124 (16)  
Gross exposure | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 148,247    
Closing/Ending balance 154,403 148,247  
Gross exposure | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,997    
Closing/Ending balance 4,985 4,997  
Gross exposure | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 22,306    
Closing/Ending balance 23,113 22,306  
Gross exposure | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,949    
Closing/Ending balance 4,160 3,949  
Gross exposure | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 116,995    
Closing/Ending balance 122,145 116,995  
Gross exposure | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 50,247    
Closing/Ending balance 55,172 50,247  
Gross exposure | Trade receivables | Retail credit cards | United States      
Loans and advances at amortised cost      
Disposals   (900)  
Gross exposure | Stage 1 | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 132,689    
Closing/Ending balance 138,892 132,689  
Gross exposure | Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,537 7,257  
Business activity in the year 635 632  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 135 197  
Final repayments (653) (893)  
Disposals 0 (2,453)  
Write-offs 0 0  
Closing/Ending balance 4,674 4,537 7,257
Gross exposure | Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 17,629 22,315  
Business activity in the year 2,575 1,508  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (980) 1,039  
Final repayments (81) (108)  
Transfers to assets held for sale   (5,495)  
Disposals 0 (691)  
Write-offs 0 0  
Closing/Ending balance 18,801 17,629 22,315
Gross exposure | Stage 1 | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,329 2,734  
Business activity in the year 1,155 1,159  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 1,176 1,640  
Final repayments (1,826) (2,003)  
Disposals 0 0  
Write-offs 0 0  
Closing/Ending balance 3,788 3,329 2,734
Gross exposure | Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 107,194 100,956  
Business activity in the year 28,266 28,497  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 4,088 3,957  
Final repayments (27,104) (25,406)  
Transfers to assets held for sale   (49)  
Disposals (1) (12)  
Write-offs 0 0  
Closing/Ending balance 111,629 107,194 100,956
Gross exposure | Stage 1 | Other financial assets      
Loans and advances at amortised cost      
Opening/Beginning balance 168,300    
Closing/Ending balance 184,400 168,300  
Gross exposure | Stage 1 | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers (92) (231)  
Gross exposure | Stage 1 | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (1,047) (1,503)  
Gross exposure | Stage 1 | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers (107) (221)  
Gross exposure | Stage 1 | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers (2,685) (2,586)  
Gross exposure | Stage 1 | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 80 91  
Gross exposure | Stage 1 | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 1,208 1,170  
Gross exposure | Stage 1 | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 80 86  
Gross exposure | Stage 1 | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers 2,417 2,098  
Gross exposure | Stage 1 | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers (27) (82)  
Gross exposure | Stage 1 | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (515) (616)  
Gross exposure | Stage 1 | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers (75) (148)  
Gross exposure | Stage 1 | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers (692) (404)  
Gross exposure | Stage 1 | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 59 19  
Gross exposure | Stage 1 | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 12 10  
Gross exposure | Stage 1 | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 56 82  
Gross exposure | Stage 1 | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 146 143  
Gross exposure | Stage 1 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 132,689    
Closing/Ending balance 138,892 132,689  
Gross exposure | Stage 1 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 4,537    
Closing/Ending balance 4,674 4,537  
Gross exposure | Stage 1 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 17,629    
Closing/Ending balance 18,801 17,629  
Gross exposure | Stage 1 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 3,329    
Closing/Ending balance 3,788 3,329  
Gross exposure | Stage 1 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 107,194    
Closing/Ending balance 111,629 107,194  
Gross exposure | Stage 1 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 47,077    
Closing/Ending balance 54,801 47,077  
Gross exposure | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 11,654    
Closing/Ending balance 11,093 11,654  
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 150 389  
Business activity in the year 0 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 2 (2)  
Final repayments (14) (45)  
Disposals (1) (313)  
Write-offs 0 0  
Closing/Ending balance 136 150 389
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 2,953 3,450  
Business activity in the year 237 206  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 262 728  
Final repayments (29) (32)  
Transfers to assets held for sale   (689)  
Disposals 0 (175)  
Write-offs 0 0  
Closing/Ending balance 2,536 2,953 3,450
Gross exposure | Lifetime expected credit losses | Stage 2 | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 404 369  
Business activity in the year 24 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 158 36  
Final repayments (313) (130)  
Disposals 0 0  
Write-offs 0 0  
Closing/Ending balance 265 404 369
Gross exposure | Lifetime expected credit losses | Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 8,147 8,967  
Business activity in the year 976 811  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 842 198  
Final repayments (1,695) (1,937)  
Transfers to assets held for sale   (9)  
Disposals (2) (2)  
Write-offs 0 0  
Closing/Ending balance 8,156 8,147 8,967
Gross exposure | Lifetime expected credit losses | Stage 2 | Other financial assets      
Loans and advances at amortised cost      
Opening/Beginning balance 1,100    
Closing/Ending balance 1,600 1,100  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 92 231  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 1,047 1,503  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 107 221  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers 2,685 2,586  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers (80) (91)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (1,208) (1,170)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers (80) (86)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers (2,417) (2,098)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers (15) (30)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (731) (876)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers (35) (53)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers (505) (392)  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 2 11  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 5 8  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 47  
Gross exposure | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 125 23  
Gross exposure | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 11,654    
Closing/Ending balance 11,093 11,654  
Gross exposure | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 150    
Closing/Ending balance 136 150  
Gross exposure | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 2,953    
Closing/Ending balance 2,536 2,953  
Gross exposure | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 404    
Closing/Ending balance 265 404  
Gross exposure | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 8,147    
Closing/Ending balance 8,156 8,147  
Gross exposure | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 3,170    
Closing/Ending balance 371 3,170  
Gross exposure | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 3,904    
Closing/Ending balance 4,418 3,904  
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 310 716  
Business activity in the year 0 2  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (19) 69  
Final repayments (80) (86)  
Disposals (9) (461)  
Write-offs (8) (12)  
Closing/Ending balance 175 310 716
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 1,724 1,522  
Business activity in the year 60 20  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (45) (45)  
Final repayments (32) (1)  
Transfers to assets held for sale   (57)  
Disposals (308) (249)  
Write-offs (852) (940)  
Closing/Ending balance 1,776 1,724 1,522
Gross exposure | Lifetime expected credit losses | Stage 3 | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 216 308  
Business activity in the year 0 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 23 74  
Final repayments (179) (224)  
Disposals 0 0  
Write-offs (7) (14)  
Closing/Ending balance 107 216 308
Gross exposure | Lifetime expected credit losses | Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 1,654 1,235  
Business activity in the year 225 183  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (50) 6  
Final repayments (40) (142)  
Transfers to assets held for sale   (1)  
Disposals (121) (2)  
Write-offs (234) (255)  
Closing/Ending balance 2,360 1,654 1,235
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 42 112  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 1,246 1,492  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 110 201  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 1,197 796  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers (61) (30)  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (17) (18)  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers (56) (129)  
Gross exposure | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers (271) (166)  
Gross exposure | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 3,904    
Closing/Ending balance 4,418 3,904  
Gross exposure | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance 310    
Closing/Ending balance 175 310  
Gross exposure | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance 1,724    
Closing/Ending balance 1,776 1,724  
Gross exposure | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance 216    
Closing/Ending balance 107 216  
Gross exposure | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance 1,654    
Closing/Ending balance 2,360 1,654  
Gross exposure | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 0    
Closing/Ending balance 0 0  
Accumulated impairment      
Loans and advances at amortised cost      
Opening/Beginning balance (3,860)    
Closing/Ending balance (4,034) (3,860)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Recoveries and reimbursements (118) (39)  
ECL charge on assets held for sale 181 74  
Total exchange and other adjustments 233 71  
Accumulated impairment | Loans and advances at amortised cost      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1,598 1,563  
Accumulated impairment | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (41) (360)  
Business activity in the year (1) (1)  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (7) (47)  
Final repayments 2 5  
Disposals 6 350  
Write-offs 8 12  
Closing/Ending balance (33) (41) (360)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 6 43  
Accumulated impairment | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (2,557) (2,776)  
Business activity in the year (202) (110)  
Refinements to models used for calculation 12 (11)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (1,002) (1,199)  
Final repayments 41 20  
Transfers to assets held for sale   271  
Disposals 270 308  
Write-offs 852 940  
Closing/Ending balance (2,586) (2,557) (2,776)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1,151 1,300  
Accumulated impairment | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (31) (45)  
Business activity in the year 0 (1)  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (16) (13)  
Final repayments 8 14  
Disposals 0 0  
Write-offs 7 14  
Closing/Ending balance (32) (31) (45)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 8 0  
Accumulated impairment | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (791) (836)  
Business activity in the year (96) (92)  
Refinements to models used for calculation 89 (69)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (500) (194)  
Final repayments 74 135  
Transfers to assets held for sale   5  
Disposals 24 5  
Write-offs 234 255  
Closing/Ending balance (966) (791) (836)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 433 220  
Accumulated impairment | Corporate loans | Barclays Investment Bank      
Loans and advances at amortised cost      
Refinements to models used for calculation 89    
Accumulated impairment | Loan commitments and financial guarantees      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (22) (53)  
Accumulated impairment | Other financial assets      
Loans and advances at amortised cost      
Opening/Beginning balance (150)    
Closing/Ending balance (145) (150)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (5) 5  
Accumulated impairment | Debt securities at amortised cost      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (1) (4)  
Accumulated impairment | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (3,420)    
Closing/Ending balance (3,617) (3,420)  
Accumulated impairment | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (41)    
Closing/Ending balance (33) (41)  
Accumulated impairment | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (2,557)    
Closing/Ending balance (2,586) (2,557)  
Accumulated impairment | Financial assets at amortised cost | Retail credit cards | United States      
Loans and advances at amortised cost      
Refinements to models used for calculation 12 (11)  
Accumulated impairment | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (31)    
Closing/Ending balance (32) (31)  
Accumulated impairment | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (791)    
Closing/Ending balance (966) (791)  
Accumulated impairment | Financial assets at amortised cost | Corporate loans | Barclays Investment Bank      
Loans and advances at amortised cost      
Refinements to models used for calculation   (69)  
Accumulated impairment | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (20)    
Closing/Ending balance (19) (20)  
Accumulated impairment | Stage 1      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Recoveries and reimbursements 10 (20)  
Accumulated impairment | Stage 1 | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (491)    
Closing/Ending balance (552) (491)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 62 (28)  
Accumulated impairment | Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (8) (11)  
Business activity in the year (1) (1)  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 1 2  
Final repayments 1 1  
Disposals 0 5  
Write-offs 0 0  
Closing/Ending balance (9) (8) (11)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1 2  
Accumulated impairment | Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (334) (412)  
Business activity in the year (75) (33)  
Refinements to models used for calculation (68) (5)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 299 280  
Final repayments 5 7  
Transfers to assets held for sale   64  
Disposals 0 20  
Write-offs 0 0  
Closing/Ending balance (395) (334) (412)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 61 6  
Accumulated impairment | Stage 1 | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (5) (8)  
Business activity in the year 0 (1)  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (4) 0  
Final repayments 3 4  
Disposals 0 0  
Write-offs 0 0  
Closing/Ending balance (7) (5) (8)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 2 (3)  
Accumulated impairment | Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (144) (179)  
Business activity in the year (40) (39)  
Refinements to models used for calculation 65 (18)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (14) 76  
Final repayments 24 40  
Transfers to assets held for sale   1  
Disposals 1 1  
Write-offs 0 0  
Closing/Ending balance (141) (144) (179)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (2) (33)  
Accumulated impairment | Stage 1 | Loan commitments and financial guarantees      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (23) (12)  
Accumulated impairment | Stage 1 | Other financial assets      
Loans and advances at amortised cost      
Opening/Beginning balance (17)    
Closing/Ending balance (17) (17)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 0 3  
Accumulated impairment | Stage 1 | Debt securities at amortised cost      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1 2  
Accumulated impairment | Stage 1 | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Stage 1 | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 35 51  
Accumulated impairment | Stage 1 | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Stage 1 | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers 11 15  
Accumulated impairment | Stage 1 | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 (3)  
Accumulated impairment | Stage 1 | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (268) (321)  
Accumulated impairment | Stage 1 | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Stage 1 | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers (46) (42)  
Accumulated impairment | Stage 1 | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Stage 1 | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 20 24  
Accumulated impairment | Stage 1 | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Stage 1 | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 4 2  
Accumulated impairment | Stage 1 | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers (2) (1)  
Accumulated impairment | Stage 1 | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (9) (9)  
Accumulated impairment | Stage 1 | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers (1) 0  
Accumulated impairment | Stage 1 | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers (2) (1)  
Accumulated impairment | Stage 1 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (491)    
Closing/Ending balance (552) (491)  
Accumulated impairment | Stage 1 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (8)    
Closing/Ending balance (9) (8)  
Accumulated impairment | Stage 1 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (334)    
Closing/Ending balance (395) (334)  
Accumulated impairment | Stage 1 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (5)    
Closing/Ending balance (7) (5)  
Accumulated impairment | Stage 1 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (144)    
Closing/Ending balance (141) (144)  
Accumulated impairment | Stage 1 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (9)    
Closing/Ending balance (10) (9)  
Accumulated impairment | Lifetime expected credit losses | Stage 2      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Recoveries and reimbursements (26) 23  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (1,063)    
Closing/Ending balance (1,036) (1,063)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (24) (150)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (1) (28)  
Business activity in the year 0 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes 0 (9)  
Final repayments 0 1  
Disposals 1 29  
Write-offs 0 0  
Closing/Ending balance 0 (1) (28)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 0 2  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (807) (1,138)  
Business activity in the year (87) (59)  
Refinements to models used for calculation 81 (2)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (508) (506)  
Final repayments 10 13  
Transfers to assets held for sale   161  
Disposals 0 69  
Write-offs 0 0  
Closing/Ending balance (796) (807) (1,138)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (11) (101)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (1) (2)  
Business activity in the year 0 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (4) 0  
Final repayments 0 1  
Disposals 0 0  
Write-offs 0 0  
Closing/Ending balance (5) (1) (2)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 4 (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (254) (309)  
Business activity in the year (37) (34)  
Refinements to models used for calculation 24 (51)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (81) 0  
Final repayments 49 92  
Transfers to assets held for sale   3  
Disposals 2 2  
Write-offs 0 0  
Closing/Ending balance (235) (254) (309)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (17) (50)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Loan commitments and financial guarantees      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (6) (23)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Other financial assets      
Loans and advances at amortised cost      
Opening/Beginning balance (7)    
Closing/Ending balance (8) (7)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1 6  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Debt securities at amortised cost      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (2) (6)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (35) (51)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers (11) (15)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 3  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 268 321  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers 46 42  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 3  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 286 390  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 28 21  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (4) (5)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers (1) (5)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (1,063)    
Closing/Ending balance (1,036) (1,063)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (1)    
Closing/Ending balance 0 (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (807)    
Closing/Ending balance (796) (807)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (1)    
Closing/Ending balance (5) (1)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (254)    
Closing/Ending balance (235) (254)  
Accumulated impairment | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (11)    
Closing/Ending balance (9) (11)  
Accumulated impairment | Lifetime expected credit losses | Stage 3      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
Recoveries and reimbursements (102) (42)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (1,866)    
Closing/Ending balance (2,029) (1,866)  
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1,560 1,741  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (32) (321)  
Business activity in the year 0 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (8) (40)  
Final repayments 1 3  
Disposals 5 316  
Write-offs 8 12  
Closing/Ending balance (24) (32) (321)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 5 39  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (1,416) (1,226)  
Business activity in the year (40) (18)  
Refinements to models used for calculation (1) (4)  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (793) (973)  
Final repayments 26 0  
Transfers to assets held for sale   46  
Disposals 270 219  
Write-offs 852 940  
Closing/Ending balance (1,395) (1,416) (1,226)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 1,101 1,395  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (25) (35)  
Business activity in the year 0 0  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (8) (13)  
Final repayments 5 9  
Disposals 0 0  
Write-offs 7 14  
Closing/Ending balance (20) (25) (35)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 2 4  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (393) (348)  
Business activity in the year (19) (19)  
Refinements to models used for calculation 0 0  
Net drawdowns, repayments, net re-measurement and movements due to exposure and risk parameter changes (405) (270)  
Final repayments 1 3  
Transfers to assets held for sale   1  
Disposals 21 2  
Write-offs 234 255  
Closing/Ending balance (590) (393) £ (348)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 452 303  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Loan commitments and financial guarantees      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 7 (18)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Other financial assets      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement (6) (4)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Debt securities at amortised cost      
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost      
ECL movement 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 1 to Stage 2 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 2 to Stage 1 | Corporate loans      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0 (3)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers (306) (414)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 0 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers to Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers (32) (23)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Retail mortgages      
Loans and advances at amortised cost      
Transfers 2 1  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Retail credit cards      
Loans and advances at amortised cost      
Transfers 13 14  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Retail other      
Loans and advances at amortised cost      
Transfers 1 0  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Transfers from Stage 3 | Corporate loans      
Loans and advances at amortised cost      
Transfers 3 6  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Loans and advances at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance (1,866)    
Closing/Ending balance (2,029) (1,866)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening/Beginning balance (32)    
Closing/Ending balance (24) (32)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening/Beginning balance (1,416)    
Closing/Ending balance (1,395) (1,416)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening/Beginning balance (25)    
Closing/Ending balance (20) (25)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening/Beginning balance (393)    
Closing/Ending balance (590) (393)  
Accumulated impairment | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost | Debt securities at amortised cost      
Loans and advances at amortised cost      
Opening/Beginning balance 0    
Closing/Ending balance £ 0 £ 0