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Financial risk management - Schedule of Mortgage Lending (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
 [1]
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers £ 449,745 £ 454,899 [1] £ 448,567
Mortgages | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 307,320 312,338  
Mortgages | Gross drawn exposures | A £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 971 731  
Mortgages | Gross drawn exposures | B £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 41,250 37,075  
Mortgages | Gross drawn exposures | C £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 64,466 60,086  
Mortgages | Gross drawn exposures | D £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 95,958 93,010  
Mortgages | Gross drawn exposures | E £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 34,327 35,015  
Mortgages | Gross drawn exposures | F £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 6,663 6,990  
Mortgages | Gross drawn exposures | G £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 1,465 1,519  
Mortgages | Gross drawn exposures | Unrated properties £m      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 62,220 77,912  
Mortgages | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 1,105 1,207  
Mortgages | Stage 1 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 256,596 257,517  
Mortgages | Stage 1 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 161 91  
Mortgages | Stage 2 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 38,533 41,783  
Mortgages | Stage 2 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 374 552  
Mortgages | Stage 3 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 4,337 3,416  
Mortgages | Stage 3 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 357 311  
Mortgages | POCI £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 7,854 9,622  
Mortgages | POCI £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 213 253  
Mortgages | Less than 70 per cent | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 233,039 255,668  
Mortgages | Less than 70 per cent | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 609 708  
Mortgages | Less than 70 per cent | Stage 1 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 193,235 210,457  
Mortgages | Less than 70 per cent | Stage 1 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 57 51  
Mortgages | Less than 70 per cent | Stage 2 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 28,754 33,205  
Mortgages | Less than 70 per cent | Stage 2 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 208 330  
Mortgages | Less than 70 per cent | Stage 3 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 3,882 3,161  
Mortgages | Less than 70 per cent | Stage 3 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 226 210  
Mortgages | Less than 70 per cent | POCI £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 7,168 8,845  
Mortgages | Less than 70 per cent | POCI £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 118 117  
Mortgages | 70 per cent to 80 per cent | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 41,542 37,581  
Mortgages | 70 per cent to 80 per cent | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 199 246  
Mortgages | 70 per cent to 80 per cent | Stage 1 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 36,413 31,788  
Mortgages | 70 per cent to 80 per cent | Stage 1 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 37 25  
Mortgages | 70 per cent to 80 per cent | Stage 2 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 4,506 5,264  
Mortgages | 70 per cent to 80 per cent | Stage 2 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 75 124  
Mortgages | 70 per cent to 80 per cent | Stage 3 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 290 170  
Mortgages | 70 per cent to 80 per cent | Stage 3 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 61 55  
Mortgages | 70 per cent to 80 per cent | POCI £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 333 359  
Mortgages | 70 per cent to 80 per cent | POCI £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 26 42  
Mortgages | 80 per cent to 90 per cent | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 23,999 14,743  
Mortgages | 80 per cent to 90 per cent | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 148 110  
Mortgages | 80 per cent to 90 per cent | Stage 1 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 20,949 11,942  
Mortgages | 80 per cent to 90 per cent | Stage 1 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 48 12  
Mortgages | 80 per cent to 90 per cent | Stage 2 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 2,821 2,604  
Mortgages | 80 per cent to 90 per cent | Stage 2 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 53 59  
Mortgages | 80 per cent to 90 per cent | Stage 3 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 87 48  
Mortgages | 80 per cent to 90 per cent | Stage 3 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 27 20  
Mortgages | 80 per cent to 90 per cent | POCI £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 142 149  
Mortgages | 80 per cent to 90 per cent | POCI £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 20 19  
Mortgages | 90 per cent to 100 per cent | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 8,491 4,051  
Mortgages | 90 per cent to 100 per cent | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 76 46  
Mortgages | 90 per cent to 100 per cent | Stage 1 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 5,981 3,319  
Mortgages | 90 per cent to 100 per cent | Stage 1 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 19 3  
Mortgages | 90 per cent to 100 per cent | Stage 2 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 2,389 606  
Mortgages | 90 per cent to 100 per cent | Stage 2 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 31 18  
Mortgages | 90 per cent to 100 per cent | Stage 3 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 30 13  
Mortgages | 90 per cent to 100 per cent | Stage 3 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 12 7  
Mortgages | 90 per cent to 100 per cent | POCI £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 91 113  
Mortgages | 90 per cent to 100 per cent | POCI £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 14 18  
Mortgages | Greater than 100 per cent | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 249 295  
Mortgages | Greater than 100 per cent | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 73 97  
Mortgages | Greater than 100 per cent | Stage 1 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 18 11  
Mortgages | Greater than 100 per cent | Stage 1 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 0 0  
Mortgages | Greater than 100 per cent | Stage 2 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 63 104  
Mortgages | Greater than 100 per cent | Stage 2 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 7 21  
Mortgages | Greater than 100 per cent | Stage 3 £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 48 24  
Mortgages | Greater than 100 per cent | Stage 3 £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 31 19  
Mortgages | Greater than 100 per cent | POCI £m | Gross drawn exposures      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers 120 156  
Mortgages | Greater than 100 per cent | POCI £m | Allowance for expected credit losses      
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]      
Loans and advances to customers £ 35 £ 57  
[1]
1    Restated for presentational changes and for the adoption of IFRS 17; see notes 1 and 54.