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Components of Net Postemployment Costs (Detail) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 1 $ 3 $ 3
Interest cost 1 2 2 3
Amortization of net gains (1)   (2)  
Net periodic benefit cost $ 2 $ 3 $ 3 $ 6