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Derivative financial instruments (Details) - GBP (£)
£ in Millions
Jun. 30, 2024
Dec. 31, 2023
Trading and other    
Fair value of assets £ 18,958 £ 22,253
Fair value of liabilities 16,206 19,644
Hedging    
Fair value of assets 25 103
Fair value of liabilities 441 505
Total recognised derivative assets 18,983 22,356
Total recognised derivative liabilities 16,647 20,149
Fair value hedges    
Hedging    
Fair value of assets 4 83
Fair value of liabilities 422 425
Cash flow hedges    
Hedging    
Fair value of assets 21 20
Fair value of liabilities 19 80
Exchange rate contracts | Trading and other    
Trading and other    
Fair value of assets 5,118 6,631
Fair value of liabilities 4,580 6,222
Interest rate contracts | Trading and other    
Trading and other    
Fair value of assets 13,538 15,116
Fair value of liabilities 11,146 12,724
Credit derivatives | Trading and other    
Trading and other    
Fair value of assets 74 51
Fair value of liabilities 146 118
Equity and other contracts | Trading and other    
Trading and other    
Fair value of assets 228 455
Fair value of liabilities £ 334 £ 580