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Income Taxes - Operating and capital loss carryforwards available (Details) - Dec. 31, 2025 £ in Millions, $ in Millions	USD ($)	GBP (£)
U.S. | Expiring 2041 - 2045
Operating and capital loss carryforwards [Line Items]
Operating loss carryforwards	$ 14
U.S. | Indefinite expiration
Operating and capital loss carryforwards [Line Items]
Operating loss carryforwards	23
United Kingdom
Operating and capital loss carryforwards [Line Items]
Operating loss carryforwards | £		£ 27
United Kingdom | Indefinite expiration
Operating and capital loss carryforwards [Line Items]
Operating loss carryforwards	$ 36

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

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