v3.25.4
Derivative financial instruments - Disclosure of total derivatives (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional contract amount £ 100,079,291 £ 83,792,768
Derivative assets 252,192 292,356
Derivative liabilities (240,757) (279,331)
At fair value    
Disclosure of risk management strategy related to hedge accounting [line items]    
Derivative assets held for trading 250,285 291,562
Derivative assets held for held for risk management 1,907 794
Derivative assets 252,192 292,356
Derivative liabilities held for trading (240,158) (278,636)
Derivative liabilities held for risk management (599) (695)
Derivative liabilities (240,757) (279,331)
Held for risk management    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional contract amount 239,559 221,158
Held for risk management | At fair value    
Disclosure of risk management strategy related to hedge accounting [line items]    
Derivative assets held for held for risk management 1,907 794
Derivative liabilities held for risk management (599) (695)
Held for trading    
Disclosure of risk management strategy related to hedge accounting [line items]    
Notional contract amount 99,839,732 83,571,610
Held for trading | At fair value    
Disclosure of risk management strategy related to hedge accounting [line items]    
Derivative assets held for trading 250,285 291,562
Derivative liabilities held for trading £ (240,158) £ (278,636)