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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished products $ 2,070 $ 2,093
Raw materials and work in process 651 655
Gross inventories 2,721 2,748
Less: excess of FIFO cost over LIFO cost (98) (129)
Total inventories $ 2,623 $ 2,619
Percent of LIFO inventories to total inventories 37.00% 37.00%