Consolidated statement of changes in equity (Parenthetical) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CONSOLIDATED STATEMENT OF CHANGES IN EQUITY [Abstract]
Comprehensive income, attributable to owners of parent	£ 3,786	£ 5,570	£ (3,005)

The amount of comprehensive income attributable to owners of the parent. [Refer: Comprehensive income]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2024-01-01
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-Subparagraph a
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-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 81B
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-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_81B_b_ii&doctype=Standard
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration