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Post-Employment and Other Long-Term Employees Benefits - Accumulated Other Comprehensive Income (Loss) Before Tax Effects (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]    
Accumulated other comprehensive loss, actuarial (gains)/losses, beginning balance $ 197 $ 152
Net amount generated/arising in current year, actuarial (gains)/losses 21 57
Amortization, actuarial (gains)/losses (13) (13)
Foreign currency translation, actuarial (gains)/losses before tax 11 1
Accumulated other comprehensive loss, actuarial (gains)/losses, ending balance 216 197
Accumulated other comprehensive loss, prior service cost, beginning balance 3 3
Net amount generated/arising in current year, prior service cost 1 1
Amortization, prior service cost (1) (1)
Foreign currency translation adjustments 0 0
Accumulated other comprehensive loss, prior service cost, ending balance 3 3
Accumulated other comprehensive loss Total, beginning balance 200 155
Net amount generated/arising in current year, Total 22 58
Amortization, Total (14) (14)
Foreign currency translation adjustment, Total 11 1
Accumulated other comprehensive loss Total, ending balance $ 219 $ 200