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Inventories (Schedule of Inventory) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Finished products $ 2,275us-gaap_InventoryFinishedGoods $ 2,189us-gaap_InventoryFinishedGoods
Raw materials and work in process 888us-gaap_InventoryWorkInProcessAndRawMaterials 724us-gaap_InventoryWorkInProcessAndRawMaterials
Gross inventories 3,163us-gaap_InventoryGross 2,913us-gaap_InventoryGross
Less: excess of FIFO cost over LIFO cost (161)us-gaap_InventoryLIFOReserve (173)us-gaap_InventoryLIFOReserve
Total inventories $ 3,002us-gaap_InventoryNet $ 2,740us-gaap_InventoryNet
Percentage of LIFO Inventory 39.00%us-gaap_PercentageOfLIFOInventory 35.00%us-gaap_PercentageOfLIFOInventory