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Components of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials $ 722 $ 782
Finished product 1,865 1,930
Inventory, Gross, Total 2,587 2,712
Inventory reserves (118) (103)
Inventories, net $ 2,469 $ 2,609