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Long-Term Employee Benefit Liabilities - Company's Termination and Long-term Service Arrangements (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Non-current liability $ 729 $ 677
Termination and Long-term Service Arrangements [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year 446 394
Current service cost 32 29
Interest cost 8 10
Actuarial (gains) losses and changes in actuarial assumptions (13) 39
Benefits paid (27) (19)
Divestiture (3)
Foreign exchange 32 (4)
Ending funded status – Plan deficit 478 446
Current liability 10 9
Non-current liability 468 437
Net amount 478 446
Unrecognized actuarial losses (106) (124)
Current service cost 32 29
Interest cost 8 10
Actuarial losses (gains) 6 4
Net periodic benefit cost $ 46 $ 43