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Allowance for expected credit losses - Group ECL with staging of assets (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 846,753 £ 841,000
Allowance for expected credit losses 4,084 4,903
Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 1,091 855
Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 1,629 1,995
Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 1,151 1,800
UK mortgages    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 1,105 1,207
UK mortgages | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 161 91
UK mortgages | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 374 552
UK mortgages | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 357 311
Retail – credit cards    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 699 666
Retail – credit cards | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 168 120
Retail – credit cards | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 401 433
Retail – credit cards | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 130 113
Retail – other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 887 943
Retail – other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 339 275
Retail – other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 320 409
Retail – other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 228 259
Commercial Banking    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 1,022 1,698
Commercial Banking | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 232 214
Commercial Banking | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 372 414
Commercial Banking | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 418 1,070
Other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 4 4
Other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 0 0
Other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 0 0
Other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Allowance for expected credit losses 4 4
Upside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets 480,988 481,220
Allowance for expected credit losses £ 2,780 £ 3,389
Coverage ratio 0.60% 0.70%
Upside | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 428,563 £ 424,678
Allowance for expected credit losses £ 728 £ 572
Coverage ratio 0.20% 0.10%
Upside | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 37,391 £ 39,280
Allowance for expected credit losses £ 959 £ 1,079
Coverage ratio 2.60% 2.70%
Upside | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,180 £ 7,640
Allowance for expected credit losses £ 880 £ 1,485
Coverage ratio 12.30% 19.40%
Upside | UK mortgages    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 307,320 £ 312,338
Allowance for expected credit losses £ 384 £ 469
Coverage ratio 0.10% 0.20%
Upside | UK mortgages | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 270,131 £ 272,780
Allowance for expected credit losses £ 20 £ 39
Coverage ratio 0.00% 0.00%
Upside | UK mortgages | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 24,998 £ 26,520
Allowance for expected credit losses £ 73 £ 137
Coverage ratio 0.30% 0.50%
Upside | UK mortgages | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 4,337 £ 3,416
Allowance for expected credit losses £ 78 £ 40
Coverage ratio 1.80% 1.20%
Upside | UK mortgages | POCI    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,854 £ 9,622
Allowance for expected credit losses £ 213 £ 253
Coverage ratio 2.70% 2.60%
Upside | Retail – credit cards    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 15,817 £ 14,992
Allowance for expected credit losses £ 593 £ 563
Coverage ratio 3.80% 3.80%
Upside | Retail – credit cards | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 13,338 £ 12,277
Allowance for expected credit losses £ 169 £ 112
Coverage ratio 1.30% 0.90%
Upside | Retail – credit cards | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 2,195 £ 2,426
Allowance for expected credit losses £ 302 £ 338
Coverage ratio 13.70% 13.90%
Upside | Retail – credit cards | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 284 £ 289
Allowance for expected credit losses £ 122 £ 113
Coverage ratio 43.00% 39.10%
Upside | Retail – other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 45,423 £ 40,230
Allowance for expected credit losses £ 923 £ 886
Coverage ratio 2.00% 2.20%
Upside | Retail – other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 39,260 £ 36,001
Allowance for expected credit losses £ 360 £ 242
Coverage ratio 0.90% 0.70%
Upside | Retail – other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 5,711 £ 3,671
Allowance for expected credit losses £ 325 £ 390
Coverage ratio 5.70% 10.60%
Upside | Retail – other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 452 £ 558
Allowance for expected credit losses £ 238 £ 254
Coverage ratio 52.70% 45.50%
Upside | Commercial Banking    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 104,757 £ 109,353
Allowance for expected credit losses £ 850 £ 1,425
Coverage ratio 0.80% 1.30%
Upside | Commercial Banking | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 98,202 £ 99,319
Allowance for expected credit losses £ 165 £ 137
Coverage ratio 0.20% 0.10%
Upside | Commercial Banking | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 4,487 £ 6,663
Allowance for expected credit losses £ 259 £ 214
Coverage ratio 5.80% 3.20%
Upside | Commercial Banking | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 2,068 £ 3,371
Allowance for expected credit losses £ 426 £ 1,074
Coverage ratio 20.60% 31.90%
Upside | Other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,671 £ 4,307
Allowance for expected credit losses £ 30 £ 46
Coverage ratio 0.40% 1.10%
Upside | Other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,632 £ 4,301
Allowance for expected credit losses £ 14 £ 42
Coverage ratio 0.20% 1.00%
Upside | Other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 0 £ 0
Allowance for expected credit losses £ 0 £ 0
Coverage ratio 0.00% 0.00%
Upside | Other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 39 £ 6
Allowance for expected credit losses £ 16 £ 4
Coverage ratio 41.00% 66.70%
Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Increase/(decrease) n probability-weighted expected credit loss £ 596 £ 820
Total financial assets 480,988 481,220
Allowance for expected credit losses £ 3,488 £ 4,083
Coverage ratio 0.70% 0.80%
Base case | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 426,214 £ 413,783
Allowance for expected credit losses £ 911 £ 750
Coverage ratio 0.20% 0.20%
Base case | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 39,740 £ 50,175
Allowance for expected credit losses £ 1,333 £ 1,448
Coverage ratio 3.40% 2.90%
Base case | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,180 £ 7,640
Allowance for expected credit losses £ 1,031 £ 1,632
Coverage ratio 14.40% 21.40%
Base case | UK mortgages    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 307,320 £ 312,338
Allowance for expected credit losses £ 617 £ 734
Coverage ratio 0.20% 0.20%
Base case | UK mortgages | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 269,581 £ 264,062
Allowance for expected credit losses £ 40 £ 55
Coverage ratio 0.00% 0.00%
Base case | UK mortgages | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 25,548 £ 35,238
Allowance for expected credit losses £ 139 £ 242
Coverage ratio 0.60% 0.70%
Base case | UK mortgages | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 4,337 £ 3,416
Allowance for expected credit losses £ 225 £ 184
Coverage ratio 5.20% 5.40%
Base case | UK mortgages | POCI    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,854 £ 9,622
Allowance for expected credit losses £ 213 £ 253
Coverage ratio 2.70% 2.60%
Base case | Retail – credit cards    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 15,817 £ 14,992
Allowance for expected credit losses £ 770 £ 719
Coverage ratio 4.90% 4.80%
Base case | Retail – credit cards | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 12,668 £ 11,583
Allowance for expected credit losses £ 211 £ 157
Coverage ratio 1.70% 1.40%
Base case | Retail – credit cards | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 2,865 £ 3,120
Allowance for expected credit losses £ 437 £ 449
Coverage ratio 15.30% 14.40%
Base case | Retail – credit cards | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 284 £ 289
Allowance for expected credit losses £ 122 £ 113
Coverage ratio 43.00% 39.10%
Base case | Retail – other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 45,423 £ 40,230
Allowance for expected credit losses £ 1,004 £ 984
Coverage ratio 2.20% 2.40%
Base case | Retail – other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 38,939 £ 35,356
Allowance for expected credit losses £ 384 £ 274
Coverage ratio 1.00% 0.80%
Base case | Retail – other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 6,032 £ 4,316
Allowance for expected credit losses £ 378 £ 453
Coverage ratio 6.30% 10.50%
Base case | Retail – other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 452 £ 558
Allowance for expected credit losses £ 242 £ 257
Coverage ratio 53.50% 46.10%
Base case | Commercial Banking    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 104,757 £ 109,353
Allowance for expected credit losses £ 1,065 £ 1,600
Coverage ratio 1.00% 1.50%
Base case | Commercial Banking | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 97,394 £ 98,481
Allowance for expected credit losses £ 260 £ 222
Coverage ratio 0.30% 0.20%
Base case | Commercial Banking | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 5,295 £ 7,501
Allowance for expected credit losses £ 379 £ 304
Coverage ratio 7.20% 4.10%
Base case | Commercial Banking | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 2,068 £ 3,371
Allowance for expected credit losses £ 426 £ 1,074
Coverage ratio 20.60% 31.90%
Base case | Other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,671 £ 4,307
Allowance for expected credit losses £ 32 £ 46
Coverage ratio 0.40% 1.10%
Base case | Other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,632 £ 4,301
Allowance for expected credit losses £ 16 £ 42
Coverage ratio 0.20% 1.00%
Base case | Other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 0 £ 0
Allowance for expected credit losses £ 0 £ 0
Coverage ratio 0.00% 0.00%
Base case | Other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 39 £ 6
Allowance for expected credit losses £ 16 £ 4
Coverage ratio 41.00% 66.70%
Downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 480,988 £ 481,220
Allowance for expected credit losses £ 4,634 £ 5,434
Coverage ratio 1.00% 1.10%
Downside | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 417,421 £ 397,095
Allowance for expected credit losses £ 1,123 £ 950
Coverage ratio 0.30% 0.20%
Downside | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 48,533 £ 66,863
Allowance for expected credit losses £ 2,029 £ 2,337
Coverage ratio 4.20% 3.50%
Downside | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,180 £ 7,640
Allowance for expected credit losses £ 1,269 £ 1,894
Coverage ratio 17.70% 24.80%
Downside | UK mortgages    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 307,320 £ 312,338
Allowance for expected credit losses £ 1,070 £ 1,344
Coverage ratio 0.40% 0.40%
Downside | UK mortgages | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 266,388 £ 259,684
Allowance for expected credit losses £ 84 £ 91
Coverage ratio 0.00% 0.00%
Downside | UK mortgages | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 28,741 £ 39,616
Allowance for expected credit losses £ 316 £ 557
Coverage ratio 1.10% 1.40%
Downside | UK mortgages | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 4,337 £ 3,416
Allowance for expected credit losses £ 457 £ 443
Coverage ratio 10.50% 13.00%
Downside | UK mortgages | POCI    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,854 £ 9,622
Allowance for expected credit losses £ 213 £ 253
Coverage ratio 2.70% 2.60%
Downside | Retail – credit cards    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 15,817 £ 14,992
Allowance for expected credit losses £ 931 £ 842
Coverage ratio 5.90% 5.60%
Downside | Retail – credit cards | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 12,109 £ 11,111
Allowance for expected credit losses £ 242 £ 195
Coverage ratio 2.00% 1.80%
Downside | Retail – credit cards | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 3,424 £ 3,592
Allowance for expected credit losses £ 567 £ 534
Coverage ratio 16.60% 14.90%
Downside | Retail – credit cards | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 284 £ 289
Allowance for expected credit losses £ 122 £ 113
Coverage ratio 43.00% 39.10%
Downside | Retail – other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 45,423 £ 40,230
Allowance for expected credit losses £ 1,076 £ 1,059
Coverage ratio 2.40% 2.60%
Downside | Retail – other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 38,373 £ 34,807
Allowance for expected credit losses £ 404 £ 298
Coverage ratio 1.10% 0.90%
Downside | Retail – other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 6,598 £ 4,865
Allowance for expected credit losses £ 424 £ 501
Coverage ratio 6.40% 10.30%
Downside | Retail – other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 452 £ 558
Allowance for expected credit losses £ 248 £ 260
Coverage ratio 54.90% 46.60%
Downside | Commercial Banking    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 104,757 £ 109,353
Allowance for expected credit losses £ 1,524 £ 2,142
Coverage ratio 1.50% 2.00%
Downside | Commercial Banking | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 92,919 £ 87,192
Allowance for expected credit losses £ 376 £ 323
Coverage ratio 0.40% 0.40%
Downside | Commercial Banking | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 9,770 £ 18,790
Allowance for expected credit losses £ 722 £ 745
Coverage ratio 7.40% 4.00%
Downside | Commercial Banking | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 2,068 £ 3,371
Allowance for expected credit losses £ 426 £ 1,074
Coverage ratio 20.60% 31.90%
Downside | Other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,671 £ 4,307
Allowance for expected credit losses £ 33 £ 47
Coverage ratio 0.40% 1.10%
Downside | Other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,632 £ 4,301
Allowance for expected credit losses £ 17 £ 43
Coverage ratio 0.20% 1.00%
Downside | Other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 0 £ 0
Allowance for expected credit losses £ 0 £ 0
Coverage ratio 0.00% 0.00%
Downside | Other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 39 £ 6
Allowance for expected credit losses £ 16 £ 4
Coverage ratio 41.00% 66.70%
Severe downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 480,988 £ 481,220
Allowance for expected credit losses £ 11,369 £ 15,854
Coverage ratio 2.40% 3.30%
Severe downside | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 257,317 £ 207,831
Allowance for expected credit losses £ 1,350 £ 1,089
Coverage ratio 0.50% 0.50%
Severe downside | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 208,637 £ 256,127
Allowance for expected credit losses £ 8,018 £ 12,217
Coverage ratio 3.80% 4.80%
Severe downside | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,180 £ 7,640
Allowance for expected credit losses £ 1,788 £ 2,295
Coverage ratio 24.90% 30.00%
Severe downside | UK mortgages    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 307,320 £ 312,338
Allowance for expected credit losses £ 5,403 £ 7,848
Coverage ratio 1.80% 2.50%
Severe downside | UK mortgages | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 129,736 £ 112,102
Allowance for expected credit losses £ 153 £ 106
Coverage ratio 0.10% 0.10%
Severe downside | UK mortgages | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 165,393 £ 187,198
Allowance for expected credit losses £ 4,074 £ 6,649
Coverage ratio 2.50% 3.60%
Severe downside | UK mortgages | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 4,337 £ 3,416
Allowance for expected credit losses £ 963 £ 840
Coverage ratio 22.20% 24.60%
Severe downside | UK mortgages | POCI    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,854 £ 9,622
Allowance for expected credit losses £ 213 £ 253
Coverage ratio 2.70% 2.60%
Severe downside | Retail – credit cards    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 15,817 £ 14,992
Allowance for expected credit losses £ 1,279 £ 1,320
Coverage ratio 8.10% 8.80%
Severe downside | Retail – credit cards | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 10,966 £ 9,049
Allowance for expected credit losses £ 298 £ 255
Coverage ratio 2.70% 2.80%
Severe downside | Retail – credit cards | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 4,567 £ 5,654
Allowance for expected credit losses £ 859 £ 952
Coverage ratio 18.80% 16.80%
Severe downside | Retail – credit cards | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 284 £ 289
Allowance for expected credit losses £ 122 £ 113
Coverage ratio 43.00% 39.10%
Severe downside | Retail – other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 45,423 £ 40,230
Allowance for expected credit losses £ 1,328 £ 1,449
Coverage ratio 2.90% 3.60%
Severe downside | Retail – other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 30,202 £ 30,927
Allowance for expected credit losses £ 448 £ 346
Coverage ratio 1.50% 1.10%
Severe downside | Retail – other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 14,769 £ 8,745
Allowance for expected credit losses £ 619 £ 839
Coverage ratio 4.20% 9.60%
Severe downside | Retail – other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 452 £ 558
Allowance for expected credit losses £ 261 £ 264
Coverage ratio 57.70% 47.30%
Severe downside | Commercial Banking    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 104,757 £ 109,353
Allowance for expected credit losses £ 3,323 £ 5,190
Coverage ratio 3.20% 4.70%
Severe downside | Commercial Banking | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 78,781 £ 51,452
Allowance for expected credit losses £ 431 £ 339
Coverage ratio 0.60% 0.70%
Severe downside | Commercial Banking | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 23,908 £ 54,530
Allowance for expected credit losses £ 2,466 £ 3,777
Coverage ratio 10.30% 6.90%
Severe downside | Commercial Banking | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 2,068 £ 3,371
Allowance for expected credit losses £ 426 £ 1,074
Coverage ratio 20.60% 31.90%
Severe downside | Other    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,671 £ 4,307
Allowance for expected credit losses £ 36 £ 47
Coverage ratio 0.50% 1.10%
Severe downside | Other | Stage 1 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 7,632 £ 4,301
Allowance for expected credit losses £ 20 £ 43
Coverage ratio 0.30% 1.00%
Severe downside | Other | Stage 2 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 0 £ 0
Allowance for expected credit losses £ 0 £ 0
Coverage ratio 0.00% 0.00%
Severe downside | Other | Stage 3 £m    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Total financial assets £ 39 £ 6
Allowance for expected credit losses £ 16 £ 4
Coverage ratio 41.00% 66.70%