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Financial instruments - classification - financial assets forming a component of ESG-linked loans (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Lending subject to performance triggers    
Financial instruments - classification    
Carrying value, Financial assets £ 22,600.0 £ 13,900.0
Reduction in cash flows 2.5  
Sustainability-linked loans    
Financial instruments - classification    
Carrying value, Financial assets £ 6,500.0 5,000.0
Positive impact on product margin 0.032%  
Negative impact on product margin 0.039%  
Reduction in cash flows £ 2.5  
Other products    
Financial instruments - classification    
Carrying value, Financial assets £ 16,100.0 £ 8,900.0