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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory, Net, Items Net of Reserve Alternative [Abstract]    
Raw materials and supplies $ 323us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 349us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work-in-process 56us-gaap_InventoryWorkInProcessNetOfReserves 55us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 971us-gaap_InventoryFinishedGoodsNetOfReserves 978us-gaap_InventoryFinishedGoodsNetOfReserves
Total Inventories $ 1,350us-gaap_InventoryNet $ 1,382us-gaap_InventoryNet