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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, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year $ 480  
Foreign currency translation adjustment (1) $ (1)
Plan assets at fair value at end of year 473 480
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year 102 109
Contributions (employer and employee) 14 14
Actual return on plan assets 1 6
Benefits paid (3) (3)
Assets sold during the year (1) (2)
Settlements (9) (11)
Foreign currency translation adjustment (2) (11)
Plan assets at fair value at end of year $ 102 $ 102