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Inventories (Schedule of Inventory) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Finished products $ 2,189us-gaap_InventoryFinishedGoods $ 1,950us-gaap_InventoryFinishedGoods
Raw materials and work in process 724us-gaap_InventoryWorkInProcessAndRawMaterials 622us-gaap_InventoryWorkInProcessAndRawMaterials
Gross inventories 2,913us-gaap_InventoryGross 2,572us-gaap_InventoryGross
Less: excess of FIFO cost over LIFO cost (173)us-gaap_InventoryLIFOReserve (164)us-gaap_InventoryLIFOReserve
Total inventories $ 2,740us-gaap_InventoryNet $ 2,408us-gaap_InventoryNet
LIFO Method Related Items [Abstract]    
Percent of LIFO inventories to total inventories 35.00%us-gaap_PercentageOfLIFOInventory 39.00%us-gaap_PercentageOfLIFOInventory