v3.25.4
Securitisations - Disclosure of transfers of financial assets that do not result in derecognition (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Assets, carrying amount £ 233,617 £ 247,018
Liabilities, carrying amount (118,697) (121,751)
Securitisation vehicles    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Assets, carrying amount 7,402 7,997
Assets, fair value 7,458 8,560
Liabilities, carrying amount (929) (1,575)
Liabilities, fair value (933) (1,579)
Credit cards, unsecured loans and other retail lending | Total loans and advances at amortised cost | Securitisation vehicles    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Assets, carrying amount 5,879 6,575
Assets, fair value 5,935 7,158
Liabilities, carrying amount (929) (1,575)
Liabilities, fair value (933) (1,579)
Mortgage Loans | Financial assets at FVTPL | Securitisation vehicles    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Assets, carrying amount 1,523 576
Assets, fair value 1,523 576
Liabilities, carrying amount 0 0
Liabilities, fair value 0 0
Personal Loans | Securitisation vehicles | Assets and liabilities classified as held for sale    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Assets, carrying amount 0 846
Assets, fair value 0 826
Liabilities, carrying amount 0 0
Liabilities, fair value £ 0 £ 0