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Post-Employment and Other Long-Term Employees Benefits - Reconciliation for Plan Assets Measured at Fair Value Using Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year $ 552  
Foreign currency translation adjustment 0 $ 0
Plan assets at fair value at end of year 527 552
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year 107 96
Contributions (employer and employee) 12 12
Actual return on plan assets (1) (2)
Net benefit payments 5 4
Settlements (4) (8)
Foreign currency translation adjustment (2) 5
Plan assets at fair value at end of year $ 117 $ 107