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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, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year $ 527  
Foreign currency translation adjustment 0 $ 0
Plan assets at fair value at end of year 597 527
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year 117 107
Contributions (employer and employee) 11 12
Actual return on plan assets (1) (1)
Net benefit payments 9 5
Settlements (34) (4)
Transfer in Level 3 11  
Foreign currency translation adjustment   (2)
Plan assets at fair value at end of year $ 113 $ 117