Provisions for Other Liabilities and Charges - Summary of Analysis of Provisions (Detail) - GBP (£) £ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of other provisions [line items]
Current	£ 8	£ 23
Non-current	12	13
Total	20	36
Property [member]
Disclosure of other provisions [line items]
Current	4	3
Non-current	6	12
Total	10	15
Legal and other [member]
Disclosure of other provisions [line items]
Current	4	20
Non-current	6	1
Total	£ 10	£ 21

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.

No definition available.

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- Definition

The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of current provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

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