v3.25.4
Post-Employment and Other Long-Term Employees Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 39 $ 32 $ 28
Interest cost 38 36 35
Expected return on plan assets (31) (29) (24)
Amortization of actuarial net loss (gain) 9 8 6
Amortization of prior service cost 0 0 1
Effect of settlement 2 0 1
Effect of curtailment 1 0 0
Net periodic benefit cost 58 47 47
Other Long-Term Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 26 23 17
Interest cost 4 3 3
Expected return on plan assets 0 0 0
Amortization of actuarial net loss (gain) 3 1 (2)
Amortization of prior service cost 0 0 0
Effect of settlement 0 0 0
Effect of curtailment 0 0 0
Net periodic benefit cost $ 33 $ 27 $ 18