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Derivatives - Analysis of cash flow reserve and foreign exchange reserve (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivatives      
Pre-tax cash flow hedge reserve £ (2,005) £ (2,629)  
Pre-tax foreign exchange hedge reserve (648) (789)  
Amount recognised in equity, cash flow hedges (872) 187 £ (2,973)
Amount recognised in equity, foreign exchange hedge reserve 122 107 £ (266)
Amount transferred from equity to earnings, cash flow hedge reserve 1,494 1,021  
Amount transferred from equity to earnings, foreign exchange hedge reserve 19 69  
Interest rate risk      
Derivatives      
Continuing cash flow hedge reserve (1,564) (2,330)  
De-designated cash flow hedge reserve (437) (304)  
Amount recognised in equity, cash flow hedges (931) 137  
Interest rate risk | Net interest income      
Derivatives      
Amount transferred from equity to earnings, cash flow hedge reserve 1,562 1,112  
Interest rate risk | Non interest income      
Derivatives      
Amount transferred from equity to earnings, cash flow hedge reserve   (10)  
Exchange rate risk      
Derivatives      
Continuing cash flow hedge reserve (6) 1  
Continuing foreign exchange hedge reserve 15 (18)  
De-designated cash flow hedge reserve 2 4  
De-designated foreign exchange hedge reserve (663) (771)  
Amount recognised in equity, cash flow hedges 59 50  
Amount recognised in equity, foreign exchange hedge reserve 122 107  
Exchange rate risk | Net interest income      
Derivatives      
Amount transferred from equity to earnings, cash flow hedge reserve (73) (74)  
Exchange rate risk | Non interest income      
Derivatives      
Amount transferred from equity to earnings, cash flow hedge reserve   (9)  
Amount transferred from equity to earnings, foreign exchange hedge reserve 19 69  
Exchange rate risk | Operating expenses      
Derivatives      
Amount transferred from equity to earnings, cash flow hedge reserve £ 5 £ 2