Structured entities - Own asset securitisations (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Structured entities
Loans and mortgages	£ 400,326	£ 381,433
Assets pledged against liabilities	33,769	39,156
Structured entities relating to other credit risk transfer securitisation
Structured entities
Loans and mortgages	13,226	2,687
Reduction in expected credit losses from financial guarantee contracts with consolidated structured entities	43	11
Structured entities relating to other credit risk transfer securitisation \| Third parties
Structured entities
Debt securities in issue	1,175	863
Structured entities relating to covered debt programme
Structured entities
Other borrowings	2,305	3,619
Structured entities relating to covered debt programme \| Loans to customers
Structured entities
Assets pledged against liabilities	9,668	11,067
Structured entities relating to lending of own issued securities \| Debt securities \| Lending of own issued securities
Structured entities
Assets pledged against liabilities	4,878	4,168
Structured entities relating to lending of own issued securities \| Secured \| Lending of own issued securities
Structured entities
Debt securities in issue	£ 4,715	£ 4,062

The amount of instruments issued by the entity that represent indebtedness.

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The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Classes of contingent liabilities [domain]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of loans and advances the entity has made to customers at amortised cost. [Refer: Loans and advances to customers; Financial assets at amortised cost]

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The amount of borrowings that the entity does not separately disclose in the same statement or note. [Refer: Borrowings]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reduction in expected credit losses from financial guarantee contracts with consolidated structured entities

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