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Financial instruments - classification - Reclassification of mortgages from amortised cost to fair value through profit or loss (Details) - GBP (£)
£ in Millions
Jul. 01, 2022
Dec. 31, 2023
Dec. 31, 2022
MVFTPL      
Reclassification of mortgages from amortised cost to fair value through profit or loss      
Financial assets   £ 125,100 £ 145,800
Loans to customers - amortised cost      
Reclassification of mortgages from amortised cost to fair value through profit or loss      
Amortised cost £ 587    
MFVTPL 606    
Change in value 19    
Assets of disposal groups      
Reclassification of mortgages from amortised cost to fair value through profit or loss      
Amortised cost 10,676    
MFVTPL 10,383    
Change in value (293)    
Mortgage loans      
Reclassification of mortgages from amortised cost to fair value through profit or loss      
Amortised cost 11,263    
MFVTPL 10,989    
Change in value £ (274)