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Post-Employment and Other Long-Term Employees Benefits - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation $ 773 $ 952  
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets 327 562  
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation 675 562  
Pension benefits components other than service cost, 12 16 $ 11
Accrued benefits related to defined contribution pension plans 23 20  
Annual cost of defined contribution plans 91 86 $ 84
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension plans with benefit obligations in excess of plan assets, benefit obligation 1,177 1,005  
Employer contributions 17 $ 21  
Expected contribution in cash $ 22