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Components of Net Postemployment Costs (Detail) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 3 $ 4
Interest cost 2 1 3 3
Net periodic benefit cost $ 3 $ 3 $ 6 $ 7