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Other disclosures - Risk Management and Principal Risks - Credit exposures by internal PD grade (audited) (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of internal credit grades [line items]    
Coverage ratio 100.00%  
Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 24,176 £ 23,313
Coverage ratio 0.80% 0.90%
Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 24,377 £ 23,515
Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 21,067 20,064
Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 2,768 3,271
Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 542 180
Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (201) (202)
Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (87) (58)
Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (111) (143)
Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (1)
Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 321,175 £ 265,583
Coverage ratio 1.00% 0.10%
Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 321,506 £ 265,880
Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 298,002 236,650
Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 23,158 28,360
Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 346 870
Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (331) (297)
Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (147) (145)
Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (164) (131)
Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (20) (21)
Financial assets at fair value, class    
Disclosure of internal credit grades [line items]    
Exposure to credit risk on loan commitments and financial guarantee contracts 14,900 18,800
Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 182,507 £ 145,259
Coverage ratio 2.10% 2.40%
Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 186,327 £ 148,758
Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 163,808 129,013
Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 18,949 16,397
Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 3,570 3,348
Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (3,820) (3,499)
Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (693) (796)
Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (1,489) (1,019)
Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (1,638) (1,684)
100% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 539 £ 179
Coverage ratio 0.60% 0.60%
100% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 542 £ 180
100% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 542 180
100% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (1)
100% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (1)
100% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 326 £ 849
Coverage ratio 5.80% 2.40%
100% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 346 £ 870
100% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 346 870
100% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (20) (21)
100% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (20) (21)
100% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 1,930 £ 1,664
Coverage ratio 45.90% 50.30%
100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 3,565 £ 3,348
100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 3,565 3,348
100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (1,635) (1,684)
100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (1,635) (1,684)
Strong | 0.0 to 0.05% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 7,436 £ 8,409
Coverage ratio 0.00% 0.00%
Strong | 0.0 to 0.05% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 7,439 £ 8,412
Strong | 0.0 to 0.05% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 7,290 8,240
Strong | 0.0 to 0.05% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 149 172
Strong | 0.0 to 0.05% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.0 to 0.05% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (3)
Strong | 0.0 to 0.05% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (2) (2)
Strong | 0.0 to 0.05% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (1) (1)
Strong | 0.0 to 0.05% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.0 to 0.05% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 70,456 £ 95,858
Coverage ratio 0.10% 0.00%
Strong | 0.0 to 0.05% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 70,462 £ 95,866
Strong | 0.0 to 0.05% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 69,737 92,864
Strong | 0.0 to 0.05% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 725 3,002
Strong | 0.0 to 0.05% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.0 to 0.05% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (6) (8)
Strong | 0.0 to 0.05% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (6) (5)
Strong | 0.0 to 0.05% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 0 (3)
Strong | 0.0 to 0.05% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 58,154 £ 53,325
Coverage ratio 0.00% 0.50%
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 58,174 £ 53,611
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 57,324 52,756
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 845 855
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 5 0
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (20) (286)
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (2) (280)
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (15) (6)
Strong | 0.0 to 0.05% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure (3) 0
Strong | 0.05 to 0.15% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 4,555 £ 3,978
Coverage ratio 0.10% 0.10%
Strong | 0.05 to 0.15% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 4,558 £ 3,982
Strong | 0.05 to 0.15% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 4,210 3,479
Strong | 0.05 to 0.15% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 348 503
Strong | 0.05 to 0.15% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.05 to 0.15% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (4)
Strong | 0.05 to 0.15% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (2) (2)
Strong | 0.05 to 0.15% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (1) (2)
Strong | 0.05 to 0.15% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.05 to 0.15% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 75,864 £ 61,309
Coverage ratio 0.10% 0.00%
Strong | 0.05 to 0.15% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 75,870 £ 61,324
Strong | 0.05 to 0.15% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 72,221 55,979
Strong | 0.05 to 0.15% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 3,649 5,345
Strong | 0.05 to 0.15% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.05 to 0.15% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (6) (15)
Strong | 0.05 to 0.15% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (5) (10)
Strong | 0.05 to 0.15% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (1) (5)
Strong | 0.05 to 0.15% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 24,768 £ 18,000
Coverage ratio 0.00% 0.00%
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 24,780 £ 18,008
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 24,545 17,797
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 235 211
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (12) (8)
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (11) (6)
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (1) (2)
Strong | 0.05 to 0.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.15 to 0.30% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 2,907 £ 2,191
Coverage ratio 0.20% 0.20%
Strong | 0.15 to 0.30% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 2,913 £ 2,195
Strong | 0.15 to 0.30% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 2,733 1,996
Strong | 0.15 to 0.30% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 180 199
Strong | 0.15 to 0.30% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.15 to 0.30% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (6) (4)
Strong | 0.15 to 0.30% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (2)
Strong | 0.15 to 0.30% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (2)
Strong | 0.15 to 0.30% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.15 to 0.30% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 61,594 £ 24,411
Coverage ratio 0.20% 0.10%
Strong | 0.15 to 0.30% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 61,608 £ 24,424
Strong | 0.15 to 0.30% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 59,350 22,345
Strong | 0.15 to 0.30% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 2,258 2,079
Strong | 0.15 to 0.30% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.15 to 0.30% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (14) (13)
Strong | 0.15 to 0.30% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (12) (7)
Strong | 0.15 to 0.30% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (2) (6)
Strong | 0.15 to 0.30% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 19,201 £ 11,962
Coverage ratio 0.20% 0.20%
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 19,241 £ 11,984
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 14,893 10,764
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 4,348 1,220
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (40) (22)
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (24) (15)
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (16) (7)
Strong | 0.15 to 0.30% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.30 to 0.60% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 3,366 £ 3,005
Coverage ratio 0.30% 0.20%
Strong | 0.30 to 0.60% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 3,375 £ 3,010
Strong | 0.30 to 0.60% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 3,161 2,794
Strong | 0.30 to 0.60% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 214 216
Strong | 0.30 to 0.60% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.30 to 0.60% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (9) (5)
Strong | 0.30 to 0.60% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (8) (4)
Strong | 0.30 to 0.60% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (1) (1)
Strong | 0.30 to 0.60% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.30 to 0.60% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 42,611 £ 25,747
Coverage ratio 0.40% 0.00%
Strong | 0.30 to 0.60% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 42,628 £ 25,757
Strong | 0.30 to 0.60% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 40,750 23,445
Strong | 0.30 to 0.60% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 1,878 2,312
Strong | 0.30 to 0.60% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.30 to 0.60% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (17) (10)
Strong | 0.30 to 0.60% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (13) (5)
Strong | 0.30 to 0.60% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (4) (5)
Strong | 0.30 to 0.60% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 31,616 £ 22,931
Coverage ratio 0.30% 0.30%
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 31,716 £ 23,001
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 30,577 21,865
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 1,139 1,136
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (100) (70)
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (87) (55)
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (13) (15)
Strong | 0.30 to 0.60% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 0.60 to 2.15% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 2,713 £ 2,249
Coverage ratio 1.00% 1.20%
Satisfactory | 0.60 to 2.15% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 2,740 £ 2,276
Satisfactory | 0.60 to 2.15% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 1,989 1,990
Satisfactory | 0.60 to 2.15% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 751 286
Satisfactory | 0.60 to 2.15% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 0.60 to 2.15% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (27) (27)
Satisfactory | 0.60 to 2.15% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (21) (19)
Satisfactory | 0.60 to 2.15% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (6) (8)
Satisfactory | 0.60 to 2.15% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 0.60 to 2.15% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 30,394 £ 26,327
Coverage ratio 0.20% 0.40%
Satisfactory | 0.60 to 2.15% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 30,455 £ 26,429
Satisfactory | 0.60 to 2.15% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 26,100 23,189
Satisfactory | 0.60 to 2.15% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 4,355 3,240
Satisfactory | 0.60 to 2.15% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 0.60 to 2.15% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (61) (102)
Satisfactory | 0.60 to 2.15% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (47) (79)
Satisfactory | 0.60 to 2.15% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (14) (23)
Satisfactory | 0.60 to 2.15% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 20,291 £ 19,661
Coverage ratio 1.40% 1.40%
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 20,584 £ 19,937
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 17,488 16,429
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 3,096 3,508
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (293) (276)
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (169) (160)
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (124) (116)
Satisfactory | 0.60 to 2.15% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 2.15 to 10% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 1,381 £ 1,281
Coverage ratio 1.80% 1.20%
Satisfactory | 2.15 to 10% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 1,406 £ 1,296
Satisfactory | 2.15 to 10% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 910 817
Satisfactory | 2.15 to 10% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 496 479
Satisfactory | 2.15 to 10% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 2.15 to 10% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (25) (15)
Satisfactory | 2.15 to 10% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (8) (5)
Satisfactory | 2.15 to 10% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (17) (10)
Satisfactory | 2.15 to 10% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 2.15 to 10% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 22,508 £ 9,070
Coverage ratio 0.30% 0.50%
Satisfactory | 2.15 to 10% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 22,578 £ 9,111
Satisfactory | 2.15 to 10% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 18,925 6,362
Satisfactory | 2.15 to 10% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 3,653 2,749
Satisfactory | 2.15 to 10% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 2.15 to 10% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (70) (41)
Satisfactory | 2.15 to 10% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (32) (20)
Satisfactory | 2.15 to 10% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (38) (21)
Satisfactory | 2.15 to 10% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 15,310 £ 11,177
Coverage ratio 4.20% 4.00%
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 15,989 £ 11,648
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 12,130 6,653
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 3,859 4,995
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (679) (471)
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (147) (169)
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (532) (302)
Satisfactory | 2.15 to 10% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 10 to 11.35% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 847 £ 798
Coverage ratio 6.50% 7.30%
Satisfactory | 10 to 11.35% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 906 £ 861
Satisfactory | 10 to 11.35% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 716 607
Satisfactory | 10 to 11.35% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 190 254
Satisfactory | 10 to 11.35% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 10 to 11.35% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (59) (63)
Satisfactory | 10 to 11.35% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (41) (21)
Satisfactory | 10 to 11.35% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (18) (42)
Satisfactory | 10 to 11.35% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 10 to 11.35% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 12,939 £ 13,213
Coverage ratio 0.40% 0.20%
Satisfactory | 10 to 11.35% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 12,995 £ 13,234
Satisfactory | 10 to 11.35% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 10,241 10,270
Satisfactory | 10 to 11.35% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 2,754 2,964
Satisfactory | 10 to 11.35% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 10 to 11.35% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (56) (21)
Satisfactory | 10 to 11.35% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (29) (8)
Satisfactory | 10 to 11.35% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (27) (13)
Satisfactory | 10 to 11.35% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 8,572 £ 3,141
Coverage ratio 3.30% 8.50%
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 8,867 £ 3,432
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 6,227 2,156
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 2,640 1,276
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (295) (291)
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (199) (39)
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (96) (252)
Satisfactory | 10 to 11.35% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Higher Risk | 11.35% to 100% | Contingent liabilities    
Disclosure of internal credit grades [line items]    
Credit exposure £ 432 £ 1,223
Coverage ratio 13.30% 6.10%
Higher Risk | 11.35% to 100% | Contingent liabilities | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 498 £ 1,303
Higher Risk | 11.35% to 100% | Contingent liabilities | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 58 141
Higher Risk | 11.35% to 100% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 440 1,162
Higher Risk | 11.35% to 100% | Contingent liabilities | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Higher Risk | 11.35% to 100% | Contingent liabilities | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (66) (80)
Higher Risk | 11.35% to 100% | Contingent liabilities | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (2) (3)
Higher Risk | 11.35% to 100% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (64) (77)
Higher Risk | 11.35% to 100% | Contingent liabilities | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Higher Risk | 11.35% to 100% | Loan commitments    
Disclosure of internal credit grades [line items]    
Credit exposure £ 4,483 £ 8,799
Coverage ratio 1.80% 0.70%
Higher Risk | 11.35% to 100% | Loan commitments | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 4,564 £ 8,865
Higher Risk | 11.35% to 100% | Loan commitments | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 678 2,196
Higher Risk | 11.35% to 100% | Loan commitments | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 3,886 6,669
Higher Risk | 11.35% to 100% | Loan commitments | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Higher Risk | 11.35% to 100% | Loan commitments | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (81) (66)
Higher Risk | 11.35% to 100% | Loan commitments | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (3) (11)
Higher Risk | 11.35% to 100% | Loan commitments | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (78) (55)
Higher Risk | 11.35% to 100% | Loan commitments | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost    
Disclosure of internal credit grades [line items]    
Credit exposure £ 2,665 £ 3,398
Coverage ratio 21.90% 10.30%
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure £ 3,411 £ 3,789
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure 624 593
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure 2,787 3,196
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | Gross | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure 0 0
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | ECL    
Disclosure of internal credit grades [line items]    
Credit exposure (746) (391)
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Stage 1    
Disclosure of internal credit grades [line items]    
Credit exposure (54) (72)
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 2    
Disclosure of internal credit grades [line items]    
Credit exposure (692) (319)
Higher Risk | 11.35% to 100% | Loans and advances at amortised cost | Financial assets at amortised cost | ECL | Lifetime expected credit losses | Stage 3    
Disclosure of internal credit grades [line items]    
Credit exposure £ 0 £ 0