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Financial instruments - Schedule of financial assets and liabilities measured at fair value (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Valuation techniques based on observable market input (Level 2)      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets £ 682 £ 480 £ 381
Derivative liabilities (552) (456) (237)
Financial assets/(liabilities) 130 24 144
Valuation techniques based on unobservable market input (Level 3)      
Disclosure of detailed information about financial instruments [line items]      
Financial assets/(liabilities) (403) (403) (316)
Financial assets - other 172 184 167
Financial liabilities - other £ (575) £ (587) £ (483)