Related party transactions - Impact to income statement (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Disclosure of transactions between related parties
Loans to customers - amortised cost	£ 381,433	£ 366,340
Customer deposits	£ 431,377	450,318
Related party, minimum ownership interest held	10.00%
Associates, Joint Ventures and Equity Shares
Disclosure of transactions between related parties
Investments accounted for using equity method and other equity investments	£ 813	837
Loans to customers - amortised cost	13
Customer deposits	12	5
Settlement balances		34
Other comprehensive income	(8)	11
Other operating income	(11)	(30)
Associates and Joint Ventures
Disclosure of transactions between related parties
Investments accounted for using equity method	668	688
Customer deposits	2	1
Other operating income	(11)	(30)
Equity Shares
Disclosure of transactions between related parties
Investments other than investments accounted for using equity method	145	149
Loans to customers - amortised cost	13
Customer deposits	10	4
Settlement balances		34
Other comprehensive income	£ (8)	£ 11
Related party, minimum ownership interest held	10.00%

The amount of deposit liabilities from customers held by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2023-01-01
-Paragraph 24
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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The amount of loans and advances the entity has made to customers.

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Investments accounted for using equity method and other equity investments

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The amount of other comprehensive income from related party transactions.

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The amount of other comprehensive income from related party transactions.

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Represents the minimum stake held as condition for related party.

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The settlement balances of related party transactions.

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