Income Taxes - Schedule of unrecognized tax benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of unrecognized income tax benefits
Unrecognized tax benefits, beginning of year	$ 134	$ 119	$ 127
Additions for income tax positions related to current year	0	15	0
Additions for income tax positions related to prior year	4	0	0
Reductions for income tax positions related to prior year	0	0	(2)
Reductions for income tax positions related to settlements	0	0	(6)
Unrecognized tax benefits, end of year	138	134	119
Amount that, if recognized, would impact the effective tax rate	$ 138	$ 134	$ 119

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 15A
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
-Paragraph 10B
-Publisher FASB
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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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