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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 27 $ 28 $ 27
Interest cost 25 25 28
Expected return on plan assets (20) (22) (22)
Amortization of actuarial net loss (gain) 8 7 3
Amortization of prior service cost 1 1  
Effect of settlement   1 1
Net periodic benefit cost 41 40 37
Other Long-Term Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3 5 7
Interest cost 2 2 2
Amortization of actuarial net loss (gain)     2
Amortization of prior service cost     1
Effect of curtailment (1) (1)  
Net periodic benefit cost $ 4 $ 6 $ 12