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Inventories, net - Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 1,250us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 1,255us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work in process 1,009us-gaap_InventoryWorkInProcessNetOfReserves 1,027us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods and purchased products 3,119us-gaap_InventoryFinishedGoodsNetOfReserves 2,999us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 5,378us-gaap_InventoryNet $ 5,281us-gaap_InventoryNet