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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, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]    
Other comprehensive loss, actuarial (gains)/losses, beginning balance $ 139 $ 137
Net amount generated/arising in current year, actuarial (gains)/losses 6 25
Amortization, actuarial (gains)/losses (10) (14)
Foreign currency translation, actuarial (gains)/losses before tax 9 (9)
Other comprehensive loss, actuarial (gains)/losses, ending balance 144 139
Other comprehensive loss, prior service cost, beginning balance 2 3
Net amount generated/arising in current year, prior service cost 0 0
Amortization, prior service cost   (1)
Foreign currency translation adjustment 0 0
Other comprehensive loss, prior service cost, ending balance 2 2
Other comprehensive loss, Total, beginning balance 141 140
Net amount generated/arising in current year, Total 6 25
Amortization, Total (10) (15)
Foreign currency translation adjustment, Total 9 (9)
Other comprehensive loss, Total, ending balance $ 146 $ 141