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Loans and advances to customers - Schedule Loans and Advances Customers (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses £ 4,903    
Exchange and other adjustments 53 £ (85) [1] £ 39
Ending balance allowance for expected credit losses 4,084 4,903  
Loans and advances to customers 449,745 454,899 [2] 448,567 [2]
Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 4,518 3,820  
Exchange and other adjustments 164 106  
Impact of transfers between stages 454 849  
Other changes in credit quality 814 443  
Additions and repayments (947) 59  
(Credit) charge to the income statement 321 1,351  
Charge (credit) to the income statement (171)    
Advances written off (1,231) (941)  
Recoveries of advances written off in previous years 116 182  
Ending balance allowance for expected credit losses 3,717 4,518 3,820
Charge/(credit) for methodology and model changes in financial assets 60 (63)  
UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 1,207 836  
Exchange and other adjustments 120 93  
Impact of transfers between stages 156 327  
Other changes in credit quality (39) 63  
(Credit) charge to the income statement (61) (295)  
Charge (credit) to the income statement (60)    
Advances written off (108) (41)  
Recoveries of advances written off in previous years 7 24  
Ending balance allowance for expected credit losses 1,105 1,207 836
Stage 1 £m      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 855    
Ending balance allowance for expected credit losses 1,091 855  
Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 700 915  
Exchange and other adjustments (7) 2  
Impact of transfers between stages 75 (18)  
Other changes in credit quality 105 (309)  
Additions and repayments 81 110  
(Credit) charge to the income statement 261 (217)  
Charge (credit) to the income statement (54)    
Ending balance allowance for expected credit losses 900 700 915
Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 91 48  
Exchange and other adjustments 0 0  
Impact of transfers between stages 9 (11)  
Other changes in credit quality 43 36  
(Credit) charge to the income statement 71 (43)  
Charge (credit) to the income statement (1)    
Ending balance allowance for expected credit losses 161 91 48
Stage 2 £m      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 1,995    
Ending balance allowance for expected credit losses 1,629 1,995  
Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 1,808 1,114  
Exchange and other adjustments (1) 0  
Impact of transfers between stages (93) 511  
Other changes in credit quality (103) 85  
Additions and repayments (85) 98  
(Credit) charge to the income statement (281) 694  
Charge (credit) to the income statement (59)    
Ending balance allowance for expected credit losses 1,467 1,808 1,114
Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 552 394  
Exchange and other adjustments 0 0  
Impact of transfers between stages (7) 189  
Other changes in credit quality (104) (21)  
(Credit) charge to the income statement (160) (158)  
Charge (credit) to the income statement (18)    
Ending balance allowance for expected credit losses 374 552 394
Stage 3 £m      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 1,800    
Ending balance allowance for expected credit losses 1,151 1,800  
Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 1,757 1,581  
Exchange and other adjustments 105 39  
Impact of transfers between stages 472 356  
Other changes in credit quality 804 618  
Additions and repayments (862) (91)  
(Credit) charge to the income statement 414 883  
Charge (credit) to the income statement (24)    
Advances written off (1,231) (928)  
Recoveries of advances written off in previous years 116 182  
Ending balance allowance for expected credit losses 1,137 1,757 1,581
Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 311 184  
Exchange and other adjustments 53 28  
Impact of transfers between stages 154 149  
Other changes in credit quality 14 (1)  
(Credit) charge to the income statement 101 (103)  
Charge (credit) to the income statement (7)    
Advances written off (108) (28)  
Recoveries of advances written off in previous years 7 24  
Ending balance allowance for expected credit losses 357 311 184
POCI £m      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 253    
Ending balance allowance for expected credit losses 213 253  
POCI £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 253 210  
Exchange and other adjustments 67 65  
Other changes in credit quality 8 49  
Additions and repayments (81) (58)  
(Credit) charge to the income statement (73) (9)  
Charge (credit) to the income statement (34)    
Advances written off 0 (13)  
Recoveries of advances written off in previous years 0 0  
Ending balance allowance for expected credit losses 213 253 210
POCI £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance allowance for expected credit losses 253 210  
Exchange and other adjustments 67 65  
Other changes in credit quality 8 49  
(Credit) charge to the income statement (73) 9  
Charge (credit) to the income statement (34)    
Advances written off 0 (13)  
Recoveries of advances written off in previous years 0 0  
Ending balance allowance for expected credit losses 213 253 210
Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance of loans and advances to customers gross carrying amount 459,417 452,387  
Beginning balance allowance for expected credit losses 4,518    
Exchange and other adjustments 1,818 (389)  
Impact of transfers between stages 0 0  
Additions and repayments (1,216) 8,178  
Decrease through derecognition, financial assets (5,442)    
Advances written off (1,231) (941)  
Recoveries of advances written off in previous years 116 182  
Ending balance of loans and advances to customers gross carrying amount 453,462 459,417 452,387
Ending balance allowance for expected credit losses 3,717 4,518  
Loans and advances to customers 449,745 454,899  
Loans and advances to customers | Stage 1 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 1 0 0  
Loans and advances to customers | Stage 2 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 2 0 0  
Loans and advances to customers | Stage 3 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 3 £ 0 £ 0  
Loans and advances to customers | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Drawn ECL coverage (%) 0.80% 1.00%  
Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages £ 0 £ 0  
Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0 0  
Stage 1 £m | Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 401 176  
Stage 1 £m | Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 66 28  
Stage 1 £m | Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (393) (167)  
Stage 1 £m | Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (65) (27)  
Stage 1 £m | Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (8) (9)  
Stage 1 £m | Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (1) (1)  
Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0 0  
Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0 0  
Stage 2 £m | Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (53) (66)  
Stage 2 £m | Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (7) (14)  
Stage 2 £m | Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 121 135  
Stage 2 £m | Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 33 25  
Stage 2 £m | Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (68) (69)  
Stage 2 £m | Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (26) (11)  
Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0 0  
Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0 0  
Stage 3 £m | Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (13) (8)  
Stage 3 £m | Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0 0  
Stage 3 £m | Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (223) (158)  
Stage 3 £m | Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (66) (63)  
Stage 3 £m | Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 236 166  
Stage 3 £m | Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 66 63  
Impact of transfers between stages | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 454 849  
Impact of transfers between stages | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 156 327  
Impact of transfers between stages | Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (260) (120)  
Impact of transfers between stages | Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages (50) (25)  
Impact of transfers between stages | Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 402 701  
Impact of transfers between stages | Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 91 254  
Impact of transfers between stages | Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 312 268  
Impact of transfers between stages | Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 115 98  
UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Impact of transfers between stages 0    
Decrease through derecognition, financial assets (2,586)    
UK mortgages | Stage 1 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 1 0    
UK mortgages | Stage 2 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 2 0    
UK mortgages | Stage 3 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 3 0    
Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Charge/(credit) for methodology and model changes in financial assets 96 2  
Stage 1 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance of loans and advances to customers gross carrying amount 380,991 400,036  
Beginning balance allowance for expected credit losses 700    
Exchange and other adjustments 1,830 (393)  
Impact of transfers between stages (235) (27,966)  
Additions and repayments 6,393 9,314  
Decrease through derecognition, financial assets (3,685)    
Ending balance of loans and advances to customers gross carrying amount 385,294 380,991 400,036
Ending balance allowance for expected credit losses 900 700  
Loans and advances to customers 384,394 380,291  
Stage 1 £m | Loans and advances to customers | Stage 1 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 1 18,991 8,330  
Stage 1 £m | Loans and advances to customers | Stage 2 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 2 (18,010) (35,046)  
Stage 1 £m | Loans and advances to customers | Stage 3 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 3 £ (1,216) £ (1,250)  
Stage 1 £m | Loans and advances to customers | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Drawn ECL coverage (%) 0.20% 0.20%  
Stage 1 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Decrease through derecognition, financial assets £ (1,202)    
Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Charge/(credit) for methodology and model changes in financial assets (33) £ 11  
Stage 2 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance of loans and advances to customers gross carrying amount 61,164 34,931  
Beginning balance allowance for expected credit losses 1,808    
Exchange and other adjustments (24) 15  
Impact of transfers between stages (2,868) 24,663  
Additions and repayments (4,213) 1,555  
Decrease through derecognition, financial assets (892)    
Ending balance of loans and advances to customers gross carrying amount 53,167 61,164 34,931
Ending balance allowance for expected credit losses 1,467 1,808  
Loans and advances to customers 51,700 59,356  
Stage 2 £m | Loans and advances to customers | Stage 1 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 1 (18,953) (8,257)  
Stage 2 £m | Loans and advances to customers | Stage 2 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 2 18,592 35,448  
Stage 2 £m | Loans and advances to customers | Stage 3 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 3 £ (2,507) £ (2,528)  
Stage 2 £m | Loans and advances to customers | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Drawn ECL coverage (%) 2.80% 3.00%  
Stage 2 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Decrease through derecognition, financial assets £ (547)    
Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Charge/(credit) for methodology and model changes in financial assets (1) £ (47)  
Stage 3 £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance of loans and advances to customers gross carrying amount 7,640 6,443  
Beginning balance allowance for expected credit losses 1,757    
Exchange and other adjustments (6) (23)  
Impact of transfers between stages 3,103 3,303  
Additions and repayments (2,353) (1,337)  
Decrease through derecognition, financial assets (122)    
Advances written off (1,231) (928)  
Recoveries of advances written off in previous years 116 182  
Ending balance of loans and advances to customers gross carrying amount 7,147 7,640 6,443
Ending balance allowance for expected credit losses 1,137 1,757  
Loans and advances to customers 6,010 5,883  
Stage 3 £m | Loans and advances to customers | Stage 1 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 1 (38) (73)  
Stage 3 £m | Loans and advances to customers | Stage 2 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 2 (582) (402)  
Stage 3 £m | Loans and advances to customers | Stage 3 £m      
Schedule Loans and Advances to Customers [Line Items]      
Transfers to Stage 3 £ 3,723 £ 3,778  
Stage 3 £m | Loans and advances to customers | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Drawn ECL coverage (%) 15.90% 23.00%  
Stage 3 £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Decrease through derecognition, financial assets £ (94)    
POCI £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Charge/(credit) for methodology and model changes in financial assets (2) £ (29)  
POCI £m | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Beginning balance of loans and advances to customers gross carrying amount 9,622 10,977  
Beginning balance allowance for expected credit losses 253    
Exchange and other adjustments 18 12  
Additions and repayments (1,043) (1,354)  
Decrease through derecognition, financial assets (743)    
Advances written off 0 (13)  
Recoveries of advances written off in previous years 0 0  
Ending balance of loans and advances to customers gross carrying amount 7,854 9,622 £ 10,977
Ending balance allowance for expected credit losses 213 253  
Loans and advances to customers £ 7,641 £ 9,369  
POCI £m | Loans and advances to customers | Loans and advances to customers      
Schedule Loans and Advances to Customers [Line Items]      
Drawn ECL coverage (%) 2.70% 2.60%  
POCI £m | UK mortgages      
Schedule Loans and Advances to Customers [Line Items]      
Decrease through derecognition, financial assets £ (743)    
[1]
1    Restated for the adoption of IFRS 17; see notes 1 and 54.
[2]
1    Restated for presentational changes and for the adoption of IFRS 17; see notes 1 and 54.