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Financial Instruments - maturity analysis - Residual Maturity (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deposits by banks    
Financial instruments    
Financial Liabilities £ 22,190 £ 20,441
Deposits by banks | Financial liabilities at amortised cost    
Financial instruments    
Financial Liabilities 22,200 20,400
Derivatives [Member]    
Financial instruments    
Financial Liabilities 72,395 94,047
Customer accounts    
Financial instruments    
Financial Liabilities 431,377 450,318
Settlement balances and short positions    
Financial instruments    
Financial Liabilities 6,645 2,012
Trading liabilities    
Financial instruments    
Financial Liabilities 53,636 52,808
Financial liabilities (other)    
Financial instruments    
Financial Liabilities 55,089 49,107
Financial liabilities, subordinated    
Financial instruments    
Financial Liabilities 5,714 6,260
Financial liabilities, subordinated | Financial liabilities at amortised cost    
Financial instruments    
Financial Liabilities 5,500 5,900
Notes in circulation    
Financial instruments    
Financial Liabilities 3,237 3,218
Notes in circulation | Financial liabilities at amortised cost    
Financial instruments    
Financial Liabilities 3,200 3,200
Lease liabilities.    
Financial instruments    
Financial Liabilities 670 1,118
Less than 12 months | Deposits by banks    
Financial instruments    
Financial Liabilities 8,954 7,799
Less than 12 months | Derivatives [Member]    
Financial instruments    
Financial Liabilities 30,721 39,331
Less than 12 months | Customer accounts    
Financial instruments    
Financial Liabilities 424,893 448,821
Less than 12 months | Settlement balances and short positions    
Financial instruments    
Financial Liabilities 6,645 2,012
Less than 12 months | Trading liabilities    
Financial instruments    
Financial Liabilities 45,349 42,760
Less than 12 months | Financial liabilities (other)    
Financial instruments    
Financial Liabilities 20,310 13,796
Less than 12 months | Financial liabilities, subordinated    
Financial instruments    
Financial Liabilities 1,047 973
Less than 12 months | Notes in circulation    
Financial instruments    
Financial Liabilities 3,237 3,218
Less than 12 months | Lease liabilities.    
Financial instruments    
Financial Liabilities 102 137
More than 12 months | Deposits by banks    
Financial instruments    
Financial Liabilities 13,236 12,642
More than 12 months | Derivatives [Member]    
Financial instruments    
Financial Liabilities 41,674 54,716
More than 12 months | Customer accounts    
Financial instruments    
Financial Liabilities 6,484 1,497
More than 12 months | Trading liabilities    
Financial instruments    
Financial Liabilities 8,287 10,048
More than 12 months | Financial liabilities (other)    
Financial instruments    
Financial Liabilities 34,779 35,311
More than 12 months | Financial liabilities, subordinated    
Financial instruments    
Financial Liabilities 4,667 5,287
More than 12 months | Lease liabilities.    
Financial instruments    
Financial Liabilities 568 981
Cash and balances at central banks    
Financial instruments    
Financial Assets 104,262 144,832
Cash and balances at central banks | Financial assets at amortised cost    
Financial instruments    
Financial Assets 104,300 144,800
Cash and balances at central banks | Less than 12 months    
Financial instruments    
Financial Assets 104,262 144,832
Trading assets    
Financial instruments    
Financial Assets 45,551 45,577
Trading assets | Less than 12 months    
Financial instruments    
Financial Assets 36,723 35,944
Trading assets | More than 12 months    
Financial instruments    
Financial Assets 8,828 9,633
Derivatives [Member]    
Financial instruments    
Financial Assets 78,904 99,545
Derivatives [Member] | Less than 12 months    
Financial instruments    
Financial Assets 29,839 38,107
Derivatives [Member] | More than 12 months    
Financial instruments    
Financial Assets 49,065 61,438
Settlement balances    
Financial instruments    
Financial Assets 7,231 2,572
Settlement balances | Less than 12 months    
Financial instruments    
Financial Assets 7,231 2,572
Loans and advances to banks [Member] | Financial assets at amortised cost    
Financial instruments    
Financial Assets 6,914 7,139
Loans and advances to banks [Member] | Less than 12 months | Financial assets at amortised cost    
Financial instruments    
Financial Assets 6,650 6,872
Loans and advances to banks [Member] | More than 12 months | Financial assets at amortised cost    
Financial instruments    
Financial Assets 264 267
Loans and advances to customers [Member] | Financial assets at amortised cost    
Financial instruments    
Financial Assets 381,433 366,340
Loans and advances to customers [Member] | Less than 12 months | Financial assets at amortised cost    
Financial instruments    
Financial Assets 87,663 84,289
Loans and advances to customers [Member] | More than 12 months | Financial assets at amortised cost    
Financial instruments    
Financial Assets 293,770 282,051
Other financial assets    
Financial instruments    
Financial Assets 51,102 30,895
Other financial assets | Less than 12 months    
Financial instruments    
Financial Assets 10,192 6,128
Other financial assets | More than 12 months    
Financial instruments    
Financial Assets £ 40,910 £ 24,767