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Post-Employment and Other Long-Term Employees Benefits - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Expected amortization of actuarial losses in year 2019 $ 12    
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation 952 $ 835  
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets 562 493  
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation 562 493  
Defined benefit plan expense other than service cost 16 11 $ 12
Accrued benefits related to defined contribution pension plans 20 18  
Annual cost of defined contribution plans 86 84 $ 77
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension plans with benefit obligations in excess of plan assets, benefit obligation 1,094 945  
Employer contributions 21 $ 26  
Expected contribution in cash $ 23