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Financial instruments - classification - financial assets forming a component of ESG-linked loans (Details) - GBP (£)
£ in Billions
Dec. 31, 2024
Dec. 31, 2023
Lending subject to performance triggers    
Financial instruments - classification    
Carrying value, Financial assets £ 27.1 £ 22.6
Sustainability-linked loans    
Financial instruments - classification    
Carrying value, Financial assets £ 6.9 6.5
Positive impact on product margin 0.031%  
Negative impact on product margin 0.04%  
Other products    
Financial instruments - classification    
Carrying value, Financial assets £ 20.2 £ 16.1