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Inventories, Net (Schedule of Inventory) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials, components and supplies $ 170us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 194us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work in process 117us-gaap_InventoryWorkInProcessNetOfReserves 135us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 2,765us-gaap_InventoryFinishedGoodsNetOfReserves 2,758us-gaap_InventoryFinishedGoodsNetOfReserves
Total Inventory $ 3,052us-gaap_InventoryNet $ 3,087us-gaap_InventoryNet