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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, 2020
Dec. 31, 2019
Offsetting [Abstract]    
Assets, Gross amounts presented in consolidated balance sheets $ 68 $ 70
Assets, Gross amounts not offset in consolidated balance sheets 13 15
Assets, Net amounts 55 55
Liabilities, Gross amounts presented in Consolidated Balance Sheets (16) (18)
Liabilities, Gross amounts not offset in Consolidated Balance Sheets (13) (15)
Liabilities, Net Amounts $ (3) $ (3)