v3.25.2
Credit risk - Loans and advances at amortised cost by product (Details)
£ in Millions
Jun. 30, 2025
GBP (£)
Dec. 31, 2024
GBP (£)
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Provisions £ 793 £ 736
Expected credit losses held against contingent liabilities and commitments    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Provisions 405 420
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 196,708 £ 195,054
Coverage ratio 0.016 0.017
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 184,032 £ 179,266
Coverage ratio 0.003 0.003
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 10,521 £ 13,750
Coverage ratio 0.089 0.072
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 9,971 £ 12,944
Coverage ratio 0.075 0.059
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 312 £ 439
Coverage ratio 0.233 0.202
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 238 £ 367
Coverage ratio 0.348 0.301
Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 2,155 £ 2,038
Coverage ratio 0.451 0.478
Total loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 142,103 £ 144,827
Coverage ratio 0.022 0.023
Total loans and advances at amortised cost | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 130,124 £ 132,198
Coverage ratio 0.004 0.004
Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 9,824 £ 10,591
Coverage ratio 0.094 0.091
Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 9,274 £ 9,785
Coverage ratio 0.079 0.075
Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 312 £ 439
Coverage ratio 0.233 0.202
Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 238 £ 367
Coverage ratio 0.348 0.301
Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 2,155 £ 2,038
Coverage ratio 0.451 0.478
Retail mortgages | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 4,933 £ 4,956
Coverage ratio 0.005 0.008
Retail mortgages | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 4,600 £ 4,529
Coverage ratio 0.001 0.002
Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 101 £ 149
Coverage ratio 0 0.007
Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 59 £ 8
Coverage ratio 0 0.111
Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 0 £ 0
Coverage ratio 0 0
Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 42 £ 141
Coverage ratio 0 0
Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 232 £ 278
Coverage ratio 0.087 0.103
Retail credit cards | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 17,882 £ 19,749
Coverage ratio 0.117 0.115
Retail credit cards | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 15,678 £ 17,295
Coverage ratio 0.019 0.019
Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 1,912 £ 2,146
Coverage ratio 0.282 0.273
Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 1,690 £ 1,897
Coverage ratio 0.242 0.225
Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 136 £ 151
Coverage ratio 0.401 0.410
Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 86 £ 98
Coverage ratio 0.580 0.605
Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 292 £ 308
Coverage ratio 0.819 0.821
Retail other | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 4,001 £ 3,918
Coverage ratio 0.009 0.008
Retail other | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 3,570 £ 3,324
Coverage ratio 0.003 0.002
Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 257 £ 403
Coverage ratio 0.012 0.002
Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 123 £ 176
Coverage ratio 0.024 0.006
Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 108 £ 157
Coverage ratio 0 0
Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 26 £ 70
Coverage ratio 0 0
Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 174 £ 191
Coverage ratio 0.103 0.116
Corporate loans | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 115,287 £ 116,204
Coverage ratio 0.007 0.007
Corporate loans | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 106,276 £ 107,050
Coverage ratio 0.001 0.001
Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 7,554 £ 7,893
Coverage ratio 0.033 0.031
Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 7,402 £ 7,704
Coverage ratio 0.033 0.030
Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 68 £ 131
Coverage ratio 0.056 0.044
Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 84 £ 58
Coverage ratio 0.087 0.121
Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 1,457 £ 1,261
Coverage ratio 0.218 0.238
Debt securities at amortised cost | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 54,605 £ 50,227
Coverage ratio 0 0
Debt securities at amortised cost | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 53,908 £ 47,068
Coverage ratio 0 0
Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 697 £ 3,159
Coverage ratio 0.016 0.003
Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 697 £ 3,159
Coverage ratio 0.016 0.003
Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 0 £ 0
Coverage ratio 0 0
Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 0 £ 0
Coverage ratio 0 0
Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 0 £ 0
Coverage ratio 0 0
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ 199,980 £ 198,494
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 184,506 179,766
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 11,547 14,824
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 10,775 13,749
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 407 550
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 365 525
Gross exposure | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 3,927 3,904
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 145,354 148,247
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 130,588 132,689
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 10,839 11,654
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 10,067 10,579
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 407 550
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 365 525
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 3,927 3,904
Gross exposure | Retail mortgages    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 4,960 4,997
Gross exposure | Retail mortgages | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 4,605 4,537
Gross exposure | Retail mortgages | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 101 150
Gross exposure | Retail mortgages | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 254 310
Gross exposure | Retail mortgages | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 4,960 4,997
Gross exposure | Retail mortgages | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 4,605 4,537
Gross exposure | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 101 150
Gross exposure | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 59 9
Gross exposure | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Gross exposure | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 42 141
Gross exposure | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 254 310
Gross exposure | Retail credit cards    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 20,253 22,306
Gross exposure | Retail credit cards | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 15,975 17,629
Gross exposure | Retail credit cards | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 2,663 2,953
Gross exposure | Retail credit cards | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 1,615 1,724
Gross exposure | Retail credit cards | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 20,253 22,306
Gross exposure | Retail credit cards | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 15,975 17,629
Gross exposure | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 2,663 2,953
Gross exposure | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 2,231 2,449
Gross exposure | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 227 256
Gross exposure | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 205 248
Gross exposure | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 1,615 1,724
Gross exposure | Retail other    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 4,036 3,949
Gross exposure | Retail other | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 3,582 3,329
Gross exposure | Retail other | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 260 404
Gross exposure | Retail other | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 194 216
Gross exposure | Retail other | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 4,036 3,949
Gross exposure | Retail other | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 3,582 3,329
Gross exposure | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 260 404
Gross exposure | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 126 177
Gross exposure | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 108 157
Gross exposure | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 26 70
Gross exposure | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 194 216
Gross exposure | Corporate loans    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 116,105 116,995
Gross exposure | Corporate loans | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 106,426 107,194
Gross exposure | Corporate loans | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 7,815 8,147
Gross exposure | Corporate loans | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 1,864 1,654
Gross exposure | Corporate loans | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 116,105 116,995
Gross exposure | Corporate loans | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 106,426 107,194
Gross exposure | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 7,815 8,147
Gross exposure | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 7,651 7,944
Gross exposure | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 72 137
Gross exposure | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 92 66
Gross exposure | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 1,864 1,654
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 54,626 50,247
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 53,918 47,077
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 708 3,170
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 708 3,170
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Gross exposure | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Gross exposure | Other financial assets subject to impairment    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 201,200 169,600
Gross exposure | Other financial assets subject to impairment | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 200,200 168,300
Gross exposure | Other financial assets subject to impairment | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 900 1,100
Gross exposure | Other assets | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 124 130
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (3,272) (3,440)
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (474) (500)
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (1,026) (1,074)
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (804) (805)
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (95) (111)
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (127) (158)
Impairment allowance | Total loans and advances at amortised cost including debt securities | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (1,772) (1,866)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (3,251) (3,420)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (464) (491)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (1,015) (1,063)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (793) (794)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (95) (111)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (127) (158)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (1,772) (1,866)
Impairment allowance | Retail mortgages    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (27) (41)
Impairment allowance | Retail mortgages | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (5) (8)
Impairment allowance | Retail mortgages | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 (1)
Impairment allowance | Retail mortgages | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (22) (32)
Impairment allowance | Retail mortgages | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (27) (41)
Impairment allowance | Retail mortgages | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (5) (8)
Impairment allowance | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 (1)
Impairment allowance | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 (1)
Impairment allowance | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Retail mortgages | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (22) (32)
Impairment allowance | Retail credit cards    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (2,371) (2,557)
Impairment allowance | Retail credit cards | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (297) (334)
Impairment allowance | Retail credit cards | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (751) (807)
Impairment allowance | Retail credit cards | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (1,323) (1,416)
Impairment allowance | Retail credit cards | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (2,371) (2,557)
Impairment allowance | Retail credit cards | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (297) (334)
Impairment allowance | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (751) (807)
Impairment allowance | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (541) (552)
Impairment allowance | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (91) (105)
Impairment allowance | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (119) (150)
Impairment allowance | Retail credit cards | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (1,323) (1,416)
Impairment allowance | Retail other    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (35) (31)
Impairment allowance | Retail other | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (12) (5)
Impairment allowance | Retail other | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (3) (1)
Impairment allowance | Retail other | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (20) (25)
Impairment allowance | Retail other | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (35) (31)
Impairment allowance | Retail other | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (12) (5)
Impairment allowance | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (3) (1)
Impairment allowance | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (3) (1)
Impairment allowance | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Retail other | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (20) (25)
Impairment allowance | Corporate loans    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (818) (791)
Impairment allowance | Corporate loans | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (150) (144)
Impairment allowance | Corporate loans | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (261) (254)
Impairment allowance | Corporate loans | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (407) (393)
Impairment allowance | Corporate loans | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (818) (791)
Impairment allowance | Corporate loans | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (150) (144)
Impairment allowance | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (261) (254)
Impairment allowance | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (249) (240)
Impairment allowance | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (4) (6)
Impairment allowance | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (8) (8)
Impairment allowance | Corporate loans | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (407) (393)
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (21) (20)
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (10) (9)
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (11) (11)
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (11) (11)
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | Not later than 30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 2 | >30 days past due    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Debt securities at amortised cost | Financial assets at amortised cost | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets 0 0
Impairment allowance | Other financial assets subject to impairment    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (144) (150)
Impairment allowance | Other financial assets subject to impairment | Stage 1    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (21) (17)
Impairment allowance | Other financial assets subject to impairment | Lifetime expected credit losses | Stage 2    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets (4) (7)
Impairment allowance | Other assets | Lifetime expected credit losses | Stage 3    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets £ (119) £ (126)