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Post-Employment and Other Long-Term Employees Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 31 $ 27 $ 27
Interest cost 21 24 24
Expected return on plan assets (23) (22) (23)
Amortization of actuarial net loss (gain) 12 10 8
Amortization of prior service cost 1 1 1
Effect of settlement 1 3  
Effect of curtailment     1
Net periodic benefit cost 43 43 38
Other Long-Term Employee Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 11 5 6
Interest cost 1 1 1
Amortization of actuarial net loss (gain) 3 7 1
Net periodic benefit cost $ 15 $ 13 $ 8