v3.25.4
Risk Management - Disclosure of loans and advances at amortised cost by product (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]      
Loans and advances £ 1,232,975 £ 1,204,773  
Provisions 766 736  
Expected credit losses held against contingent liabilities and commitments      
Disclosure of financial assets [line items]      
Provisions 398 420  
Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (4,034) (3,860)  
Total loans and advances at amortised cost including debt securities      
Disclosure of financial assets [line items]      
Loans and advances 205,939 195,054  
Loans and advances at amortised cost      
Disclosure of financial assets [line items]      
Loans and advances 150,786 144,827  
Loans and advances at amortised cost | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 138,892 132,689  
Loans and advances at amortised cost | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (552) (491)  
Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 11,093 11,654  
Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1,036) (1,063)  
Loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 4,418 3,904  
Loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (2,029) (1,866)  
Retail mortgages      
Disclosure of financial assets [line items]      
Loans and advances 4,952 4,956  
Retail mortgages | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 4,985 4,997 £ 8,362
Retail mortgages | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (33) (41) (360)
Retail mortgages | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 4,674 4,537 7,257
Retail mortgages | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (9) (8) (11)
Retail mortgages | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 136 150 389
Retail mortgages | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 (1) (28)
Retail mortgages | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 175 310 716
Retail mortgages | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (24) (32) (321)
Retail credit cards      
Disclosure of financial assets [line items]      
Loans and advances 20,527 19,749  
Retail credit cards | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 23,113 22,306 27,287
Retail credit cards | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (2,586) (2,557) (2,776)
Retail credit cards | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 18,801 17,629 22,315
Retail credit cards | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (395) (334) (412)
Retail credit cards | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 2,536 2,953 3,450
Retail credit cards | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (796) (807) (1,138)
Retail credit cards | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 1,776 1,724 1,522
Retail credit cards | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1,395) (1,416) (1,226)
Retail other      
Disclosure of financial assets [line items]      
Loans and advances 4,128 3,918  
Retail other | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 4,160 3,949 3,411
Retail other | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (32) (31) (45)
Retail other | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 3,788 3,329 2,734
Retail other | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (7) (5) (8)
Retail other | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 265 404 369
Retail other | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (5) (1) (2)
Retail other | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 107 216 308
Retail other | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (20) (25) (35)
Corporate loans      
Disclosure of financial assets [line items]      
Loans and advances 121,179 116,204  
Corporate loans | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 122,145 116,995 111,158
Corporate loans | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (966) (791) (836)
Corporate loans | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 111,629 107,194 100,956
Corporate loans | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (141) (144) (179)
Corporate loans | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 8,156 8,147 8,967
Corporate loans | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (235) (254) (309)
Corporate loans | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 2,360 1,654 1,235
Corporate loans | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (590) (393) £ (348)
Other financial assets subject to impairment | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 186,100 169,600  
Other financial assets subject to impairment | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (145) (150)  
Other financial assets subject to impairment | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 184,400 168,300  
Other financial assets subject to impairment | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (17) (17)  
Other financial assets subject to impairment | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 1,600 1,100  
Other financial assets subject to impairment | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (8) (7)  
Other assets | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances 123 130  
Other assets | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (120) (126)  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities      
Disclosure of financial assets [line items]      
Loans and advances £ 205,939 £ 195,054  
Coverage ratio 1.70% 1.70%  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 209,575 £ 198,494  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (3,636) (3,440)  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 193,131 £ 179,266  
Coverage ratio 0.30% 0.30%  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 193,693 £ 179,766  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (562) (500)  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 10,419 £ 13,750  
Coverage ratio 9.10% 7.20%  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 11,464 £ 14,824  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1,045) (1,074)  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 2,389 £ 2,038  
Coverage ratio 45.90% 47.80%  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 4,418 £ 3,904  
Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (2,029) (1,866)  
Financial assets at amortised cost | Loans and advances at amortised cost      
Disclosure of financial assets [line items]      
Loans and advances £ 150,786 £ 144,827  
Coverage ratio 2.30% 2.30%  
Financial assets at amortised cost | Loans and advances at amortised cost | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 154,403 £ 148,247  
Financial assets at amortised cost | Loans and advances at amortised cost | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (3,617) (3,420)  
Financial assets at amortised cost | Loans and advances at amortised cost | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 138,340 £ 132,198  
Coverage ratio 0.40% 0.40%  
Financial assets at amortised cost | Loans and advances at amortised cost | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 138,892 £ 132,689  
Financial assets at amortised cost | Loans and advances at amortised cost | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (552) (491)  
Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 10,057 £ 10,591  
Coverage ratio 9.30% 9.10%  
Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 11,093 £ 11,654  
Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1,036) (1,063)  
Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 2,389 £ 2,038  
Coverage ratio 45.90% 47.80%  
Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 4,418 £ 3,904  
Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (2,029) (1,866)  
Financial assets at amortised cost | Retail mortgages      
Disclosure of financial assets [line items]      
Loans and advances £ 4,952 £ 4,956  
Coverage ratio 0.70% 0.80%  
Financial assets at amortised cost | Retail mortgages | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 4,985 £ 4,997  
Financial assets at amortised cost | Retail mortgages | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (33) (41)  
Financial assets at amortised cost | Retail mortgages | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 4,665 £ 4,529  
Coverage ratio 0.20% 0.20%  
Financial assets at amortised cost | Retail mortgages | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 4,674 £ 4,537  
Financial assets at amortised cost | Retail mortgages | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (9) (8)  
Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 136 £ 149  
Coverage ratio 0.00% 0.70%  
Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 136 £ 150  
Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 (1)  
Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 151 £ 278  
Coverage ratio 13.70% 10.30%  
Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 175 £ 310  
Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (24) (32)  
Financial assets at amortised cost | Retail credit cards      
Disclosure of financial assets [line items]      
Loans and advances £ 20,527 £ 19,749  
Coverage ratio 11.20% 11.50%  
Financial assets at amortised cost | Retail credit cards | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 23,113 £ 22,306  
Financial assets at amortised cost | Retail credit cards | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (2,586) (2,557)  
Financial assets at amortised cost | Retail credit cards | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 18,406 £ 17,295  
Coverage ratio 2.10% 1.90%  
Financial assets at amortised cost | Retail credit cards | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 18,801 £ 17,629  
Financial assets at amortised cost | Retail credit cards | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (395) (334)  
Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 1,740 £ 2,146  
Coverage ratio 31.40% 27.30%  
Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 2,536 £ 2,953  
Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (796) (807)  
Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 381 £ 308  
Coverage ratio 78.50% 82.10%  
Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 1,776 £ 1,724  
Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1,395) (1,416)  
Financial assets at amortised cost | Retail other      
Disclosure of financial assets [line items]      
Loans and advances £ 4,128 £ 3,918  
Coverage ratio 0.80% 0.80%  
Financial assets at amortised cost | Retail other | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 4,160 £ 3,949  
Financial assets at amortised cost | Retail other | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (32) (31)  
Financial assets at amortised cost | Retail other | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 3,781 £ 3,324  
Coverage ratio 0.20% 0.20%  
Financial assets at amortised cost | Retail other | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 3,788 £ 3,329  
Financial assets at amortised cost | Retail other | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (7) (5)  
Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 260 £ 403  
Coverage ratio 1.90% 0.20%  
Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 265 £ 404  
Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (5) (1)  
Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 87 £ 191  
Coverage ratio 18.70% 11.60%  
Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 107 £ 216  
Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (20) (25)  
Financial assets at amortised cost | Corporate loans      
Disclosure of financial assets [line items]      
Loans and advances £ 121,179 £ 116,204  
Coverage ratio 0.80% 0.70%  
Financial assets at amortised cost | Corporate loans | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 122,145 £ 116,995  
Financial assets at amortised cost | Corporate loans | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (966) (791)  
Financial assets at amortised cost | Corporate loans | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 111,488 £ 107,050  
Coverage ratio 0.10% 0.10%  
Financial assets at amortised cost | Corporate loans | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 111,629 £ 107,194  
Financial assets at amortised cost | Corporate loans | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (141) (144)  
Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 7,921 £ 7,893  
Coverage ratio 2.90% 3.10%  
Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 8,156 £ 8,147  
Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (235) (254)  
Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 1,770 £ 1,261  
Coverage ratio 25.00% 23.80%  
Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 2,360 £ 1,654  
Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (590) (393)  
Financial assets at amortised cost | Debt securities at amortised cost      
Disclosure of financial assets [line items]      
Loans and advances £ 55,153 £ 50,227  
Coverage ratio 0.00% 0.00%  
Financial assets at amortised cost | Debt securities at amortised cost | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 55,172 £ 50,247  
Financial assets at amortised cost | Debt securities at amortised cost | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (19) (20)  
Financial assets at amortised cost | Debt securities at amortised cost | Stage 1      
Disclosure of financial assets [line items]      
Loans and advances £ 54,791 £ 47,068  
Coverage ratio 0.00% 0.00%  
Financial assets at amortised cost | Debt securities at amortised cost | Stage 1 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 54,801 £ 47,077  
Financial assets at amortised cost | Debt securities at amortised cost | Stage 1 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (10) (9)  
Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 362 £ 3,159  
Coverage ratio 2.40% 0.30%  
Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 371 £ 3,170  
Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (9) (11)  
Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 3      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0  
Coverage ratio 0.00% 0.00%  
Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 3 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0  
Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 3 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 0  
Not past due | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 9,709 £ 12,944  
Coverage ratio 7.10% 5.90%  
Not past due | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 10,448 £ 13,749  
Not past due | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (739) (805)  
Not past due | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 9,347 £ 9,785  
Coverage ratio 7.20% 7.50%  
Not past due | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 10,077 £ 10,579  
Not past due | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (730) (794)  
Not past due | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 34 £ 8  
Coverage ratio 0.00% 11.10%  
Not past due | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 34 £ 9  
Not past due | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 (1)  
Not past due | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 1,514 £ 1,897  
Coverage ratio 25.10% 22.50%  
Not past due | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 2,022 £ 2,449  
Not past due | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (508) (552)  
Not past due | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 77 £ 176  
Coverage ratio 3.80% 0.60%  
Not past due | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 80 £ 177  
Not past due | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (3) (1)  
Not past due | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 7,722 £ 7,704  
Coverage ratio 2.80% 3.00%  
Not past due | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 7,941 £ 7,944  
Not past due | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (219) (240)  
Not past due | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 362 £ 3,159  
Coverage ratio 2.40% 0.30%  
Not past due | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 371 £ 3,170  
Not past due | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (9) (11)  
Not more than one month | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 310 £ 439  
Coverage ratio 26.50% 20.20%  
Not more than one month | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 422 £ 550  
Not more than one month | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (112) (111)  
Not more than one month | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 310 £ 439  
Coverage ratio 26.50% 20.20%  
Not more than one month | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 422 £ 550  
Not more than one month | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (112) (111)  
Not more than one month | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 1 £ 0  
Coverage ratio 0.00% 0.00%  
Not more than one month | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 1 £ 0  
Not more than one month | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 0  
Not more than one month | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 133 £ 151  
Coverage ratio 44.10% 41.00%  
Not more than one month | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 238 £ 256  
Not more than one month | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (105) (105)  
Not more than one month | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 122 £ 157  
Coverage ratio 0.80% 0.00%  
Not more than one month | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 123 £ 157  
Not more than one month | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1) 0  
Not more than one month | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 54 £ 131  
Coverage ratio 10.00% 4.40%  
Not more than one month | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 60 £ 137  
Not more than one month | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (6) (6)  
Not more than one month | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0  
Coverage ratio 0.00% 0.00%  
Not more than one month | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0  
Not more than one month | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 0  
Greater than 30 days past due | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 400 £ 367  
Coverage ratio 32.70% 30.10%  
Greater than 30 days past due | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 594 £ 525  
Greater than 30 days past due | Financial assets at amortised cost | Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (194) (158)  
Greater than 30 days past due | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 400 £ 367  
Coverage ratio 32.70% 30.10%  
Greater than 30 days past due | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 594 £ 525  
Greater than 30 days past due | Financial assets at amortised cost | Loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (194) (158)  
Greater than 30 days past due | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 101 £ 141  
Coverage ratio 0.00% 0.00%  
Greater than 30 days past due | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 101 £ 141  
Greater than 30 days past due | Financial assets at amortised cost | Retail mortgages | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances 0 0  
Greater than 30 days past due | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 93 £ 98  
Coverage ratio 66.30% 60.50%  
Greater than 30 days past due | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 276 £ 248  
Greater than 30 days past due | Financial assets at amortised cost | Retail credit cards | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (183) (150)  
Greater than 30 days past due | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 61 £ 70  
Coverage ratio 1.60% 0.00%  
Greater than 30 days past due | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 62 £ 70  
Greater than 30 days past due | Financial assets at amortised cost | Retail other | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (1) 0  
Greater than 30 days past due | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 145 £ 58  
Coverage ratio 6.50% 12.10%  
Greater than 30 days past due | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 155 £ 66  
Greater than 30 days past due | Financial assets at amortised cost | Corporate loans | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances (10) (8)  
Greater than 30 days past due | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0  
Coverage ratio 0.00% 0.00%  
Greater than 30 days past due | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Gross exposure      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0  
Greater than 30 days past due | Financial assets at amortised cost | Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance      
Disclosure of financial assets [line items]      
Loans and advances £ 0 £ 0