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Long-Term Employee Benefit Liabilities - Company's Retirement Medical Benefits Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Non-current liability $ 670 $ 667
Retirement Medical Benefits Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year 31 32
Interest cost 1 1
Actuarial losses (gains) and changes in actuarial assumptions 2 (1)
Benefits paid (2) (1)
Foreign exchange 1  
Ending funded status 33 31
Current liability 2 2
Non-current liability 31 29
Net amount 33 31
Unrecognized past service costs 1 1
Unrecognized actuarial gains 8 11
Total accumulated other comprehensive income 9 12
Actuarial gains (1) (1)
Net periodic benefit cost 0 0
Retirement Medical Benefits Plans [Member] | Net Periodic Benefit Costs [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1 $ 1