The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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- Definition

The proportion of the voting rights in an associate held by the entity. [Refer: Total for all associates [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items representing the disclosure of summary of significant accounting policies.

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Impact on reduction of operating profit for the period, Percent.

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Liquid Assets

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Percentage of emision in greenhouse gas in 2030.

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Percentage of emision in greenhouse gas in 2050.

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Total borrowing capacity on revolving credit facility.

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Useful lives or amortization period of intangible assets.

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Accounting Policies - Additional Information (Detail) £ in Billions, $ in Billions	12 Months Ended
	Dec. 31, 2025 GBP (£)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025 USD ($)
Disclosure of Summary of Significant Accounting Policies [Line items]
Liquid Assets \| £	£ 1.3
Percentage of emision in greenhouse gas in 2050	90.00%			90.00%
Percentage of emision in greenhouse gas in 2030	50.00%			50.00%
severe but plausible scenario [Member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Impact on Reduction of operating profit for the period, Percent	41.00%			41.00%
Revolving credit facility [Member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Total borrowing capacity on revolving credit facility \| $				$ 1.8
Sterling [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Average foreign exchange rate	1.32	1.28	1.25
Year end foreign exchange rate	1.35	1.25	1.27	1.35
Bottom of range [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Percentage of voting rights held in associate	20.00%
Bottom of range [member] \| Software [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	3 years
Bottom of range [member] \| Internally developed software [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	3 years
Bottom of range [member] \| Acquired intangible assets [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	2 years
Top of range [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Percentage of voting rights held in associate	50.00%
Top of range [member] \| Software [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	8 years
Top of range [member] \| Internally developed software [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	10 years
Top of range [member] \| Acquired intangible assets [member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	20 years
Top of range [member] \| Product Development Assets [Member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	7 years
Top of range [member] \| Platform Assets [Member] \| Product Development Assets [Member]
Disclosure of Summary of Significant Accounting Policies [Line items]
Useful lives of intangible assets	10 years