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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Finished products $ 2,506 $ 2,076
Raw materials and work in process 614 617
Gross inventories 3,120 2,693
Less: excess of FIFO cost over LIFO cost (160) (160)
Total inventories $ 2,960 $ 2,533
Percentage of LIFO Inventory 44.00% 41.00%