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Components of Net Postemployment Costs (Detail) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1 $ 2
Interest cost 1 1
Amortization of net gains (1)  
Net periodic benefit cost $ 1 $ 3