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Post-Employment and Other Long-Term Employees Benefits - Rollforward Accumulated Other Comprehensive Income (Loss) Before Tax Effects (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Actuarial (gains)/losses |  |
Accumulated other comprehensive loss, actuarial (gains)/losses, beginning balance | $ 69 | $ 49
Net amount generated/arising in current year | 7 | 25
Amortization | (8) | (6)
Foreign currency translation adjustment | (1) | 1
Accumulated other comprehensive loss, actuarial (gains)/losses, ending balance | 67 | 69
Prior service cost |  |
Accumulated other comprehensive loss, prior service cost, beginning balance | (1) | 1
Net amount generated/arising in current year | 3 | (1)
Amortization | 0 | (1)
Foreign currency translation adjustment | 0 | 0
Accumulated other comprehensive loss, prior service cost, ending balance | 2 | (1)
Total |  |
Defined benefit plan, accumulated other comprehensive (income) loss, before tax | 68 | 50
Net amount generated/arising in current year | 10 | 24
Amortization | (8) | (7)
Foreign currency translation adjustment | (1) | 1
Defined benefit plan, accumulated other comprehensive (income) loss, before tax | $ 69 | $ 68

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