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Long-Term Employee Benefit Liabilities - Company's Termination and Long Service Arrangements (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Non-current liability $ 670 $ 667
Termination and Long Service Arrangements [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year 327 295
Current service cost 20 20
Interest cost 7 8
Actuarial losses (gains) and changes in actuarial assumptions (7) 15
Benefits paid (11) (11)
Acquisition   16
Foreign exchange 42 (16)
Ending funded status 378 327
Current liability 10 8
Non-current liability 368 319
Net amount 378 327
Unrecognized actuarial losses (73) (84)
Current service cost 20 20
Interest cost 7 8
Actuarial losses 3 1
Net periodic benefit cost $ 30 $ 29