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Post-Employment and Other Long-Term Employees Benefits - Schedule of Accumulated Benefit Obligations (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligations $ 804 $ 828
Other Long-Term Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligations $ 5