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Derivative financial instruments (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
Trading and other      
Fair value of assets £ 23,638 £ 24,678  
Fair value of liabilities 23,135 23,515  
Hedging      
Fair value of assets 32 75  
Fair value of liabilities 527 527  
Total recognised derivative assets 23,670 24,753 [1] £ 22,051
Total recognised derivative liabilities 23,662 24,042 [1] £ 18,060
Fair value hedges      
Hedging      
Fair value of assets 1 11  
Fair value of liabilities 449 503  
Cash flow hedges      
Hedging      
Fair value of assets 31 64  
Fair value of liabilities 78 24  
Exchange rate contracts | Trading and other      
Trading and other      
Fair value of assets 5,865 8,733  
Fair value of liabilities 6,424 9,216  
Interest rate contracts | Trading and other      
Trading and other      
Fair value of assets 17,107 14,966  
Fair value of liabilities 15,881 13,332  
Credit derivatives | Trading and other      
Trading and other      
Fair value of assets 61 134  
Fair value of liabilities 87 118  
Equity and other contracts | Trading and other      
Trading and other      
Fair value of assets 605 845  
Fair value of liabilities £ 743 £ 849  
[1] Restated for presentational changes and for the adoption of IFRS 17; see notes 1, 24 and 25.