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Post-Employment and Other Long-Term Employees Benefits - Changes in Benefit Obligation and Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in plan assets:      
Plan assets at fair value at beginning of year $ 473    
Foreign currency translation adjustments   $ (1)  
Plan assets at fair value at end of year 477 473  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets   8  
Pension Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 816 863  
Service cost 27 28 $ 27
Interest cost 25 25 28
Employee contributions 7 5  
Benefits paid (27) (27)  
Effect of curtailment (6) (3)  
Effect of settlement (10) (10)  
Actuarial (gain) loss 36 (21)  
Plan amendment   (2)  
Foreign currency translation adjustment (43) (42)  
Benefit obligation at end of year 825 816 863
Change in plan assets:      
Plan assets at fair value at beginning of year 473 480  
Actual return on plan assets 31 (3)  
Employer contributions 27 28  
Employee contributions 7 5  
Benefits paid (18) (17)  
Effect of settlement (10) (10)  
Foreign currency translation adjustments (33) (10)  
Plan assets at fair value at end of year 477 473 480
Funded status (348) (343)  
Net amount recognized in the balance sheet consisted of the following:      
Non-current assets   8  
Current liabilities (9) (8)  
Long-term liabilities (339) (343)  
Net amount recognized (348) (343)  
Other Long-Term Benefit [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 54 65  
Service cost 3 5 7
Interest cost 2 2 2
Benefits paid (5) (11)  
Effect of curtailment (1) (1)  
Foreign currency translation adjustment (1) (6)  
Benefit obligation at end of year 52 54 $ 65
Change in plan assets:      
Funded status (52) (54)  
Net amount recognized in the balance sheet consisted of the following:      
Current liabilities (3) (3)  
Long-term liabilities (49) (51)  
Net amount recognized $ (52) $ (54)