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Derivatives - Summary of derivatives (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets £ 78,406 £ 78,904
Derivative financial liabilities 72,082 72,395
Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 13,628,000 13,403,000
Derivative financial assets 78,406 78,904
Derivative financial liabilities 72,082 72,395
Derivatives | Derivatives traded on recognised exchange    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,067,000 820,000
Derivative financial assets 26 48
Derivative financial liabilities 17 34
Derivatives | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 12,561,000 12,583,000
Derivative financial assets 78,380 78,856
Derivative financial liabilities 72,065 72,361
Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 10,333,000 10,268,000
Derivative financial assets 37,499 44,563
Derivative financial liabilities 31,532 38,483
Interest rate derivatives | Derivatives traded on recognised exchange    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,066,000 819,000
Derivative financial assets 20 48
Derivative financial liabilities 2 34
Interest rate derivatives | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 9,267,000 9,449,000
Derivative financial assets 37,479 44,515
Derivative financial liabilities 31,530 38,449
Interest rate derivatives | Derivatives traded over the counter and settled through clearing counterparties    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 7,321,000 7,280,000
Interest rate swaps    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 7,015,000 6,533,000
Derivative financial assets 28,960 33,807
Derivative financial liabilities 23,138 27,424
Interest rate swaps | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 7,015,000 6,533,000
Derivative financial assets 28,960 33,807
Derivative financial liabilities 23,138 27,424
Interest rate options    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 2,226,000 2,184,000
Derivative financial assets 8,539 10,756
Derivative financial liabilities 8,394 11,059
Interest rate options | Derivatives traded on recognised exchange    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 736,000 510,000
Derivative financial assets 20 48
Derivative financial liabilities 2 34
Interest rate options | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,490,000 1,674,000
Derivative financial assets 8,519 10,708
Derivative financial liabilities 8,392 11,025
Interest rate forwards and futures    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,092,000 1,551,000
Interest rate forwards and futures | Derivatives traded on recognised exchange    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 330,000 309,000
Interest rate forwards and futures | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 762,000 1,242,000
Exchange rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 3,279,000 3,120,000
Derivative financial assets 40,797 34,161
Derivative financial liabilities 40,306 33,586
Exchange rate derivatives | Derivatives traded on recognised exchange    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,000 1,000
Derivative financial assets 6  
Derivative financial liabilities 15  
Exchange rate derivatives | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 3,278,000 3,119,000
Derivative financial assets 40,791 34,161
Derivative financial liabilities 40,291 33,586
Currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 454,000 449,000
Derivative financial assets 8,450 8,173
Derivative financial liabilities 8,195 7,370
Currency swaps | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 454,000 449,000
Derivative financial assets 8,450 8,173
Derivative financial liabilities 8,195 7,370
Exchange rate option contracts    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 852,000 675,000
Derivative financial assets 5,391 4,181
Derivative financial liabilities 5,576 4,197
Exchange rate option contracts | Derivatives traded on recognised exchange    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,000 1,000
Derivative financial assets 6  
Derivative financial liabilities 15  
Exchange rate option contracts | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 851,000 674,000
Derivative financial assets 5,385 4,181
Derivative financial liabilities 5,561 4,197
Exchange rate spots, forwards and futures    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,973,000 1,996,000
Derivative financial assets 26,956 21,807
Derivative financial liabilities 26,535 22,019
Exchange rate spots, forwards and futures | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,973,000 1,996,000
Derivative financial assets 26,956 21,807
Derivative financial liabilities 26,535 22,019
Credit derivatives    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 14,000 15,000
Derivative financial assets 110 180
Derivative financial liabilities 244 326
Credit derivatives | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 14,000 15,000
Derivative financial assets 110 180
Derivative financial liabilities 244 £ 326
Equity and commodity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 2,000  
Equity and commodity derivatives | Derivatives traded over the counter    
Disclosure of detailed information about financial instruments [line items]    
Notional amount £ 2,000