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Components of Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials $ 819 $ 782
Finished product 2,063 1,930
Inventory, Gross, Total 2,882 2,712
Inventory reserves (106) (103)
Inventories, net $ 2,776 $ 2,609