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Components of Net Postemployment Costs (Detail) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 2 $ 5 $ 6
Interest cost 1 2 4 5
Net periodic benefit cost $ 3 $ 4 $ 9 $ 11