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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, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year $ 473  
Foreign currency translation adjustment   $ (1)
Plan assets at fair value at end of year 477 473
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year 102 102
Contributions (employer and employee) 16 14
Actual return on plan assets (3) 1
Benefits paid (6) (3)
Assets sold during the year   (1)
Settlements (10) (9)
Foreign currency translation adjustment (3) (2)
Plan assets at fair value at end of year $ 96 $ 102