v3.26.1
Credit Risk - Disclosure of movement in gross exposures and impairment allowance including provisions for loan commitments and financial guarantees (Details) - GBP (£)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Reconciliation of ECL movement to impairment charges for the period      
Total income statement charges for the period £ 1,394 £ 1,112 £ 2,279
Financial guarantee contracts      
Reconciliation of ECL movement to impairment charges for the period      
Recoveries and reimbursements (42) (58)  
ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 427,367    
Closing balance 423,762   427,367
Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 177,450    
Business activity in the period 17,704    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (4,168)    
Final repayments (8,355)    
Disposals (957)    
Write-offs (5)    
Closing balance 181,669   177,450
Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 40,281    
Business activity in the period 2,330    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (437)    
Final repayments (206)    
Disposals (250)    
Write-offs (615)    
Closing balance 41,103   40,281
Gross exposure | Retail credit cards | Best Egg Inc      
Loans and advances at amortised cost      
Business activity in the period 101    
Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 14,431    
Business activity in the period 3,347    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (665)    
Final repayments (2,219)    
Disposals (21)    
Write-offs (102)    
Closing balance 14,771   14,431
Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 134,650    
Business activity in the period 21,624    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 1,551    
Final repayments (18,162)    
Disposals (55)    
Write-offs (334)    
Closing balance 139,274   134,650
Gross exposure | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 427,783    
Closing balance 424,195   427,783
Gross exposure | ECL movement on other financial assets      
Loans and advances at amortised cost      
Opening balance 224,100    
Closing balance 286,400   224,100
Impairment allowance      
Loans and advances at amortised cost      
Opening balance (5,727)    
Closing balance (5,969)   (5,727)
Reconciliation of ECL movement to impairment charges for the period      
Recoveries and reimbursements (108)    
ECL charge on assets held for sale 50    
Total exchange and other adjustments (61)    
Impairment allowance | Loans and advances      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 1,497    
Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (117)    
Business activity in the period (3)    
Refinements to models used for calculation 1    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (25)    
Final repayments 9    
Disposals 3    
Write-offs 5    
Closing balance (127)   (117)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 18    
Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (3,329)    
Business activity in the period (103)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (878)    
Final repayments 65    
Disposals 194    
Write-offs 615    
Closing balance (3,436)   (3,329)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 916    
Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (517)    
Business activity in the period (58)    
Refinements to models used for calculation 2    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (107)    
Final repayments 26    
Disposals 16    
Write-offs 102    
Closing balance (536)   (517)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 137    
Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (1,326)    
Business activity in the period (45)    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (433)    
Final repayments 52    
Disposals 1    
Write-offs 334    
Closing balance (1,417)   (1,326)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 426    
Impairment allowance | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance (416)    
Closing balance (433)   (416)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 17    
Impairment allowance | ECL movement on other financial assets      
Loans and advances at amortised cost      
Opening balance (150)    
Closing balance (151)   (150)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 1    
Impairment allowance | ECL movement on debt securities at amortised cost      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement (2)    
Transfers from Stage 1 to Stage 2 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 1 to Stage 2 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 2 to Stage 1 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers to Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Transfers from Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Financial assets at amortised cost | Loans and advances      
Loans and advances at amortised cost      
Opening balance 361,523    
Write-offs (1,056) (747)  
Closing balance 371,301   361,523
Reconciliation of ECL movement to impairment charges for the period      
Post write-off recoveries 66 43  
Net write-offs 990 £ 704  
Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 177,333    
Closing balance 181,542   177,333
Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 36,952    
Closing balance 37,667   36,952
Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening balance 13,914    
Closing balance 14,235   13,914
Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening balance 133,324    
Closing balance 137,857   133,324
Financial assets at amortised cost | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 68,475    
Closing balance 73,519   68,475
Financial assets at amortised cost | Gross exposure | Loans and advances      
Loans and advances at amortised cost      
Opening balance 366,812    
Closing balance 376,817   366,812
Financial assets at amortised cost | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 177,450    
Disposals (957)    
Closing balance 181,669   177,450
Financial assets at amortised cost | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 40,281    
Disposals (250)    
Closing balance 41,103   40,281
Financial assets at amortised cost | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 14,431    
Disposals (21)    
Closing balance 14,771   14,431
Financial assets at amortised cost | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 134,650    
Disposals (55)    
Closing balance 139,274   134,650
Financial assets at amortised cost | Gross exposure | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 68,497    
Closing balance 73,539   68,497
Financial assets at amortised cost | Impairment allowance | Loans and advances      
Loans and advances at amortised cost      
Opening balance (5,289)    
Closing balance (5,516)   (5,289)
Financial assets at amortised cost | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (117)    
Closing balance (127)   (117)
Financial assets at amortised cost | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (3,329)    
Closing balance (3,436)   (3,329)
Financial assets at amortised cost | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (517)    
Closing balance (536)   (517)
Financial assets at amortised cost | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (1,326)    
Closing balance (1,417)   (1,326)
Financial assets at amortised cost | Impairment allowance | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance (22)    
Closing balance (20)   (22)
Retail other | Gross exposure | Best Egg Inc      
Loans and advances at amortised cost      
Business activity in the period 122    
Stage 1 | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 410,349    
Closing balance 407,044   410,349
Stage 1 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 161,654    
Business activity in the period 17,491    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (3,815)    
Final repayments (7,385)    
Disposals (379)    
Write-offs 0    
Closing balance 165,632   161,654
Stage 1 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 33,723    
Business activity in the period 2,163    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (708)    
Final repayments (105)    
Disposals 0    
Write-offs 0    
Closing balance 34,108   33,723
Stage 1 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 12,349    
Business activity in the period 3,101    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (845)    
Final repayments (1,806)    
Disposals 0    
Write-offs 0    
Closing balance 12,297   12,349
Stage 1 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 120,853    
Business activity in the period 21,366    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 1,609    
Final repayments (17,047)    
Disposals (55)    
Write-offs 0    
Closing balance 125,692   120,853
Stage 1 | Gross exposure | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 410,493    
Closing balance 407,202   410,493
Stage 1 | Gross exposure | ECL movement on other financial assets      
Loans and advances at amortised cost      
Opening balance 222,400    
Closing balance 285,500   222,400
Stage 1 | Impairment allowance      
Reconciliation of ECL movement to impairment charges for the period      
Recoveries and reimbursements (13)    
Stage 1 | Impairment allowance | Loans and advances      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 10    
Stage 1 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (17)    
Business activity in the period (3)    
Refinements to models used for calculation 2    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 1    
Disposals 0    
Write-offs 0    
Closing balance (19)   (17)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 2    
Stage 1 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (566)    
Business activity in the period (60)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 314    
Final repayments 5    
Disposals 0    
Write-offs 0    
Closing balance (582)   (566)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 16    
Stage 1 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (101)    
Business activity in the period (27)    
Refinements to models used for calculation 2    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 43    
Final repayments 10    
Disposals 0    
Write-offs 0    
Closing balance (110)   (101)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 9    
Stage 1 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (207)    
Business activity in the period (23)    
Refinements to models used for calculation 2    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 49    
Final repayments 17    
Disposals 1    
Write-offs 0    
Closing balance (189)   (207)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement (17)    
Stage 1 | Impairment allowance | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance (144)    
Closing balance (158)   (144)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 14    
Stage 1 | Impairment allowance | ECL movement on other financial assets      
Loans and advances at amortised cost      
Opening balance (18)    
Closing balance (17)   (18)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement (1)    
Stage 1 | Impairment allowance | ECL movement on debt securities at amortised cost      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement (2)    
Stage 1 | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers (5,412)    
Stage 1 | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers (2,169)    
Stage 1 | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers (917)    
Stage 1 | Transfers from Stage 1 to Stage 2 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers (2,679)    
Stage 1 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 1    
Stage 1 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 63    
Stage 1 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 8    
Stage 1 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 14    
Stage 1 | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 3,648    
Stage 1 | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 1,519    
Stage 1 | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 538    
Stage 1 | Transfers from Stage 2 to Stage 1 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 2,186    
Stage 1 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers (3)    
Stage 1 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers (343)    
Stage 1 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers (46)    
Stage 1 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers (37)    
Stage 1 | Transfers to Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers (197)    
Stage 1 | Transfers to Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers (331)    
Stage 1 | Transfers to Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers (124)    
Stage 1 | Transfers to Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers (698)    
Stage 1 | Transfers to Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Stage 1 | Transfers to Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 15    
Stage 1 | Transfers to Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 1    
Stage 1 | Transfers to Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 1    
Stage 1 | Transfers from Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 27    
Stage 1 | Transfers from Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 16    
Stage 1 | Transfers from Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 1    
Stage 1 | Transfers from Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 157    
Stage 1 | Transfers from Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Stage 1 | Transfers from Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers (10)    
Stage 1 | Transfers from Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Stage 1 | Transfers from Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers (6)    
Stage 1 | Financial assets at amortised cost | Loans and advances      
Loans and advances at amortised cost      
Opening balance 327,688    
Closing balance 336,829   327,688
Stage 1 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 161,637    
Closing balance 165,613   161,637
Stage 1 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 33,157    
Closing balance 33,526   33,157
Stage 1 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening balance 12,248    
Closing balance 12,187   12,248
Stage 1 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening balance 120,646    
Closing balance 125,503   120,646
Stage 1 | Financial assets at amortised cost | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 68,113    
Closing balance 72,351   68,113
Stage 1 | Financial assets at amortised cost | Gross exposure | Loans and advances      
Loans and advances at amortised cost      
Opening balance 328,579    
Closing balance 337,729   328,579
Stage 1 | Financial assets at amortised cost | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 161,654    
Closing balance 165,632   161,654
Stage 1 | Financial assets at amortised cost | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 33,723    
Closing balance 34,108   33,723
Stage 1 | Financial assets at amortised cost | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 12,349    
Closing balance 12,297   12,349
Stage 1 | Financial assets at amortised cost | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 120,853    
Closing balance 125,692   120,853
Stage 1 | Financial assets at amortised cost | Gross exposure | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 68,126    
Closing balance 72,362   68,126
Stage 1 | Financial assets at amortised cost | Impairment allowance | Loans and advances      
Loans and advances at amortised cost      
Opening balance (891)    
Closing balance (900)   (891)
Stage 1 | Financial assets at amortised cost | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (17)    
Closing balance (19)   (17)
Stage 1 | Financial assets at amortised cost | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (566)    
Closing balance (582)   (566)
Stage 1 | Financial assets at amortised cost | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (101)    
Closing balance (110)   (101)
Stage 1 | Financial assets at amortised cost | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (207)    
Closing balance (189)   (207)
Stage 1 | Financial assets at amortised cost | Impairment allowance | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance (13)    
Closing balance (11)   (13)
Lifetime expected credit losses | Stage 2 | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 16,233    
Closing balance 15,912   16,233
Lifetime expected credit losses | Stage 2 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 13,829    
Business activity in the period 213    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (300)    
Final repayments (760)    
Disposals (420)    
Write-offs 0    
Closing balance 14,100   13,829
Lifetime expected credit losses | Stage 2 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 4,479    
Business activity in the period 164    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 313    
Final repayments (46)    
Disposals 0    
Write-offs 0    
Closing balance 4,865   4,479
Lifetime expected credit losses | Stage 2 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 1,718    
Business activity in the period 238    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 143    
Final repayments (325)    
Disposals 0    
Write-offs 0    
Closing balance 2,041   1,718
Lifetime expected credit losses | Stage 2 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 10,638    
Business activity in the period 214    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 204    
Final repayments (991)    
Disposals 0    
Write-offs 0    
Closing balance 10,388   10,638
Lifetime expected credit losses | Stage 2 | Gross exposure | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 16,473    
Closing balance 16,150   16,473
Lifetime expected credit losses | Stage 2 | Gross exposure | ECL movement on other financial assets      
Loans and advances at amortised cost      
Opening balance 1,600    
Closing balance 800   1,600
Lifetime expected credit losses | Stage 2 | Impairment allowance      
Reconciliation of ECL movement to impairment charges for the period      
Recoveries and reimbursements (11)    
Lifetime expected credit losses | Stage 2 | Impairment allowance | Loans and advances      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 34    
Lifetime expected credit losses | Stage 2 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (16)    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (9)    
Final repayments 1    
Disposals 1    
Write-offs 0    
Closing balance (21)   (16)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 6    
Lifetime expected credit losses | Stage 2 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (1,194)    
Business activity in the period (41)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (593)    
Final repayments 14    
Disposals 0    
Write-offs 0    
Closing balance (1,215)   (1,194)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 21    
Lifetime expected credit losses | Stage 2 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (183)    
Business activity in the period (27)    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (49)    
Final repayments 7    
Disposals 0    
Write-offs 0    
Closing balance (190)   (183)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 7    
Lifetime expected credit losses | Stage 2 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (315)    
Business activity in the period (11)    
Refinements to models used for calculation (1)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (44)    
Final repayments 26    
Disposals 0    
Write-offs 0    
Closing balance (315)   (315)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 2 | Impairment allowance | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance (240)    
Closing balance (238)   (240)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement (2)    
Lifetime expected credit losses | Stage 2 | Impairment allowance | ECL movement on other financial assets      
Loans and advances at amortised cost      
Opening balance (8)    
Closing balance (10)   (8)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 2    
Lifetime expected credit losses | Stage 2 | Impairment allowance | ECL movement on debt securities at amortised cost      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 5,412    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 2,169    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 917    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 2,679    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers (1)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers (63)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers (8)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 1 to Stage 2 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers (14)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers (3,648)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers (1,519)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers (538)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers (2,186)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 3    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 343    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 46    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 2 to Stage 1 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 37    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers (300)    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers (708)    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers (121)    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers (294)    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 1    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 325    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 27    
Lifetime expected credit losses | Stage 2 | Transfers to Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 19    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 74    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 13    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 9    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 124    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers (1)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers (6)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers (3)    
Lifetime expected credit losses | Stage 2 | Transfers from Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers (12)    
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Loans and advances      
Loans and advances at amortised cost      
Opening balance 28,956    
Closing balance 29,653   28,956
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 13,813    
Closing balance 14,079   13,813
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 3,285    
Closing balance 3,650   3,285
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening balance 1,535    
Closing balance 1,851   1,535
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening balance 10,323    
Closing balance 10,073   10,323
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 362    
Closing balance 1,168   362
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Gross exposure | Loans and advances      
Loans and advances at amortised cost      
Opening balance 30,664    
Closing balance 31,394   30,664
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 13,829    
Closing balance 14,100   13,829
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 4,479    
Closing balance 4,865   4,479
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 1,718    
Closing balance 2,041   1,718
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 10,638    
Closing balance 10,388   10,638
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Gross exposure | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 371    
Closing balance 1,177   371
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Impairment allowance | Loans and advances      
Loans and advances at amortised cost      
Opening balance (1,708)    
Closing balance (1,741)   (1,708)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (16)    
Closing balance (21)   (16)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (1,194)    
Closing balance (1,215)   (1,194)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (183)    
Closing balance (190)   (183)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (315)    
Closing balance (315)   (315)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost | Impairment allowance | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance (9)    
Closing balance (9)   (9)
Lifetime expected credit losses | Stage 3 excluding POCI | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 780    
Closing balance 801   780
Lifetime expected credit losses | Stage 3 excluding POCI | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 1,967    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (53)    
Final repayments (210)    
Disposals (158)    
Write-offs (5)    
Closing balance 1,937   1,967
Lifetime expected credit losses | Stage 3 excluding POCI | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 2,055    
Business activity in the period 3    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (31)    
Final repayments (55)    
Disposals (250)    
Write-offs (615)    
Closing balance 2,117   2,055
Lifetime expected credit losses | Stage 3 excluding POCI | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 349    
Business activity in the period 8    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 44    
Final repayments (88)    
Disposals (21)    
Write-offs (102)    
Closing balance 425   349
Lifetime expected credit losses | Stage 3 excluding POCI | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 3,159    
Business activity in the period 44    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (262)    
Final repayments (124)    
Disposals 0    
Write-offs (334)    
Closing balance 3,194   3,159
Lifetime expected credit losses | Stage 3 excluding POCI | Gross exposure | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 812    
Closing balance 838   812
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance      
Reconciliation of ECL movement to impairment charges for the period      
Recoveries and reimbursements (84)    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | Loans and advances      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 1,453    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (84)    
Business activity in the period 0    
Refinements to models used for calculation (1)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (16)    
Final repayments 7    
Disposals 2    
Write-offs 5    
Closing balance (87)   (84)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 10    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (1,569)    
Business activity in the period (2)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (599)    
Final repayments 46    
Disposals 194    
Write-offs 615    
Closing balance (1,639)   (1,569)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 879    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (233)    
Business activity in the period (4)    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (101)    
Final repayments 9    
Disposals 16    
Write-offs 102    
Closing balance (236)   (233)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 121    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (804)    
Business activity in the period (11)    
Refinements to models used for calculation (1)    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (438)    
Final repayments 9    
Disposals 0    
Write-offs 334    
Closing balance (913)   (804)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 443    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance (32)    
Closing balance (37)   (32)
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 5    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | ECL movement on other financial assets      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Impairment allowance | ECL movement on debt securities at amortised cost      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 497    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 1,039    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 245    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 992    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers (1)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers (340)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers (28)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers to Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers (20)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers (101)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers (29)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers (10)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers (281)    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 1    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 16    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 3    
Lifetime expected credit losses | Stage 3 excluding POCI | Transfers from Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 18    
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Loans and advances      
Loans and advances at amortised cost      
Opening balance 4,840    
Closing balance 4,798   4,840
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 1,883    
Closing balance 1,850   1,883
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 486    
Closing balance 478   486
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening balance 116    
Closing balance 189   116
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening balance 2,355    
Closing balance 2,281   2,355
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Gross exposure | Loans and advances      
Loans and advances at amortised cost      
Opening balance 7,530    
Closing balance 7,673   7,530
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 1,967    
Closing balance 1,937   1,967
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 2,055    
Closing balance 2,117   2,055
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 349    
Closing balance 425   349
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 3,159    
Closing balance 3,194   3,159
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Gross exposure | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Impairment allowance | Loans and advances      
Loans and advances at amortised cost      
Opening balance (2,690)    
Closing balance (2,875)   (2,690)
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance (84)    
Closing balance (87)   (84)
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance (1,569)    
Closing balance (1,639)   (1,569)
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance (233)    
Closing balance (236)   (233)
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance (804)    
Closing balance (913)   (804)
Lifetime expected credit losses | Stage 3 excluding POCI | Financial assets at amortised cost | Impairment allowance | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 5    
Closing balance 5   5
Lifetime expected credit losses | Stage 3 POCI | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 0    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 24    
Business activity in the period 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (11)    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 13   24
Lifetime expected credit losses | Stage 3 POCI | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 15    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (7)    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 8   15
Lifetime expected credit losses | Stage 3 POCI | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 0    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Gross exposure | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 5    
Closing balance 5   5
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance      
Reconciliation of ECL movement to impairment charges for the period      
Recoveries and reimbursements 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | Loans and advances      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 0    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 0   0
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 0    
Business activity in the period 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 0   0
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance 0    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 0   0
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance 0    
Business activity in the period 0    
Refinements to models used for calculation 0    
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 0    
Final repayments 0    
Disposals 0    
Write-offs 0    
Closing balance 0   0
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | ECL movement on loan commitments and other financial guarantees      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | ECL movement on other financial assets      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Impairment allowance | ECL movement on debt securities at amortised cost      
Reconciliation of ECL movement to impairment charges for the period      
ECL movement 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 1 to Stage 2 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 2 to Stage 1 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers to Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Gross exposure | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Transfers from Stage 3 | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Transfers 0    
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Loans and advances      
Loans and advances at amortised cost      
Opening balance 39    
Closing balance 21   39
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 24    
Closing balance 13   24
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Retail other      
Loans and advances at amortised cost      
Opening balance 15    
Closing balance 8   15
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Corporate loans      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Gross exposure | Loans and advances      
Loans and advances at amortised cost      
Opening balance 39    
Closing balance 21   39
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Gross exposure | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Gross exposure | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 24    
Closing balance 13   24
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Gross exposure | Retail other      
Loans and advances at amortised cost      
Opening balance 15    
Closing balance 8   15
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Gross exposure | Corporate loans      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Gross exposure | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Impairment allowance | Loans and advances      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Impairment allowance | Retail mortgages      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Impairment allowance | Retail credit cards      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Impairment allowance | Retail other      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Impairment allowance | Corporate loans      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance 0   0
Lifetime expected credit losses | Stage 3 POCI | Financial assets at amortised cost | Impairment allowance | ECL movement on debt securities at amortised cost      
Loans and advances at amortised cost      
Opening balance 0    
Closing balance £ 0   £ 0