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Inventories, net - Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 1,255us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 1,175us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work in process 1,027us-gaap_InventoryWorkInProcessNetOfReserves 798us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods and purchased products 2,999us-gaap_InventoryFinishedGoodsNetOfReserves 3,630us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 5,281us-gaap_InventoryNet $ 5,603us-gaap_InventoryNet