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Fair value of financial instruments - Sensitivity analysis of valuations using unobservable inputs (Details) - Level 3 - Derivatives - Recurring fair value measurement - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement £ 727 £ 555
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (967) (651)
Unfavourable changes, Equity 0 0
Corporate debt    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 45 38
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (27) (28)
Unfavourable changes, Equity 0 0
Non-asset backed loans    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 244 99
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (450) (150)
Unfavourable changes, Equity 0 0
Private equity investments    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 10 10
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (10) (11)
Unfavourable changes, Equity 0 0
Other    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 53 44
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (64) (62)
Unfavourable changes, Equity 0 0
Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 119 51
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (155) (79)
Unfavourable changes, Equity 0 0
Foreign exchange derivatives    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 16 20
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (22) (28)
Unfavourable changes, Equity 0 0
Credit derivatives    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 79 112
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (71) (103)
Unfavourable changes, Equity 0 0
Equity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Favorable changes, Income statement 161 181
Favourable changes, Equity 0 0
Unfavourable changes, Income Statement (168) (190)
Unfavourable changes, Equity £ 0 £ 0