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Asset transfers (Details) - Securities repurchase agreements or lending transactions - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised £ 9,983 £ 26,705
Fair value of associated liabilities 9,501 24,747
Trading assets    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised 6,668 13,084
Loans to banks - amortised cost    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised 16 38
Loans to customers - amortised cost    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised 398 1,837
Other financial assets    
Securities repurchase agreements or lending transactions    
Fair value of transferred financial asset not derecognised £ 2,901 £ 11,746