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Components of Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 764 $ 722
Finished product 2,154 1,865
Inventories, gross 2,918 2,587
Inventory reserves (137) (118)
Inventories, net $ 2,781 $ 2,469