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Financial Instruments - classification - IBOR reform (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Bank deposits    
Financial instruments by type of interest rate    
Financial Liabilities £ 31,452 £ 22,190
Other financial liabilities    
Financial instruments by type of interest rate    
Financial Liabilities 61,087 55,089
Other financial assets    
Financial instruments by type of interest rate    
Financial Assets 63,243 51,102
Derivatives    
Financial instruments by type of interest rate    
Derivatives notional (£bn) 13,628,000 13,403,000
Currency swaps    
Financial instruments by type of interest rate    
Derivatives notional (£bn) £ 454,000 £ 449,000