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Components of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 1,210us-gaap_InventoryRawMaterialsNetOfReserves $ 1,122us-gaap_InventoryRawMaterialsNetOfReserves
Finished product 2,211us-gaap_InventoryFinishedGoodsNetOfReserves 2,358us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 3,421us-gaap_InventoryNet $ 3,480us-gaap_InventoryNet