Long-term Employee Benefits - (Narrative) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Employer contributions during period	$ 0	$ 4	$ 3	$ 8
Funding ratio premium discounts	3		3
Estimated future employer contributions in current fiscal year	$ 1		$ 1

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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+ Details

- 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.

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