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Asset transfers - Assets pledged as collateral (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Asset transfers    
Assets pledged against liabilities £ 39,156 £ 35,972
Debt securities classified as other assets pledged against liabilities 482 482
Loans to customers and debt instruments transferred to provide collateral for issue of debt 11,067 8,156
Debt securities and other borrowings issued for which collateral is provided by transferred assets 3,619 4,132
Trading assets    
Asset transfers    
Assets pledged against liabilities 10,976 15,062
Loans to banks - amortised cost    
Asset transfers    
Assets pledged against liabilities 63 66
Loans to customers - amortised cost    
Asset transfers    
Assets pledged against liabilities 21,611 17,493
Other financial assets    
Asset transfers    
Assets pledged against liabilities £ 6,506 £ 3,351