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Asset transfers (Details) - Securities repurchase agreements or lending transactions - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised £ 26,705 £ 32,112
Fair value of associated liabilities 24,747 31,932
Trading assets    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised 13,084 20,526
Loans to banks - amortised cost.    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised 38 5
Loans to customers - amortised cost.    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised 1,837 39
Financial assets (Other)    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised £ 11,746 £ 11,542