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Components of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 782 $ 1,215
Finished product 1,930 2,434
Inventory, Gross, Total 2,712 3,649
Inventory reserves (103) (169)
Inventories, net $ 2,609 $ 3,480