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Post-Employment and Other Long-Term Employees Benefits - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Expected amortization of actuarial losses in year 2016 $ 8    
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation 554 $ 585  
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets 291 291  
Accrued benefits related to defined contribution pension plans 16 16  
Annual cost of defined contribution plans 70 81 $ 89
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension plans with benefit obligations in excess of plan assets, benefit obligation 660 699  
Pension plans with benefit obligations in excess of plan assets, fair value of plan assets 309 307  
Employer contributions 28 $ 28  
Expected contribution in cash $ 28