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Derivative financial instruments (Tables)
 6 Months Ended
Jun. 30, 2021
Derivative financial instruments.  
Schedule of derivative financial instruments
At 30 June 2021
At 31 December 2020
Fair value
of assets		Fair value
of liabilities		Fair value
of assets		Fair value
of liabilities
£m£m£m£m
Hedging
Derivatives designated as fair value hedges123 284 478 256 
Derivatives designated as cash flow hedges59 131 338 428 
182 415 816 684 
Trading
Exchange rate contracts4,780 4,062 6,779 7,414 
Interest rate contracts16,700 12,653 21,644 18,564 
Credit derivatives101 206 108 174 
Equity and other contracts430 615 266 477 
22,011 17,536 28,797 26,629 
Total recognised derivative assets/liabilities22,193 17,951 29,613 27,313