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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, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year $ 718  
Foreign currency translation adjustment 0 $ 0
Plan assets at fair value at end of year 743 718
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value at beginning of year 162 113
Contributions (employer and employee) 15 14
Actual return on plan assets 2 2
Net benefit payments 1 11
Settlements (8)  
Transfer in Level 3   10
Foreign currency translation adjustment (5) 12
Plan assets at fair value at end of year $ 167 $ 162