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Long-Term Employee Benefit Liabilities - Company's Retirement Medical Benefits Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Non-current liability $ 597 $ 670
Retirement Medical Benefits Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Beginning of year 33 31
Interest cost 1 1
Actuarial (gains) losses and changes in actuarial assumptions (3) 2
Benefits paid (1) (2)
Foreign exchange (1) 1
Ending funded status 29 33
Current liability 2 2
Non-current liability 27 31
Net amount 29 33
Unrecognized past service costs   1
Unrecognized actuarial gains 12 8
Total accumulated other comprehensive income 12 9
Interest cost 1 1
Actuarial (gains) losses (1) (1)
Net periodic benefit cost $ 0 $ 0