Long-term Employee Benefits - (Narrative) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]
Employer contributions during period	$ 3	$ 4
Estimated future employer contributions in current fiscal year	$ 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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