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Components of Net Postemployment Costs (Detail) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 4 $ 5
Interest cost 1 1 3 4
Amortization of net gains (1)   (3)  
Net periodic benefit cost $ 1 $ 3 $ 4 $ 9