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Financial Instruments - Derivative Foreign Currency Contracts at Gross Fair Value and Unrecognized Impacts of Master Netting Arrangements (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Offsetting [Abstract]    
Assets, Gross amounts presented in consolidated balance sheets $ 18 $ 31
Assets, Gross amounts not offset in consolidated balance sheets 17 30
Assets, Net amounts 1 1
Liabilities, Gross amounts presented in Consolidated Balance Sheets (195) (343)
Liabilities, Gross amounts not offset in Consolidated Balance Sheets (17) (30)
Liabilities, Net Amounts $ (178) $ (313)