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Components of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 711 $ 722
Finished product 1,975 1,865
Inventories, gross 2,686 2,587
Inventory reserves (129) (118)
Inventories, net $ 2,557 $ 2,469