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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Finished products $ 2,547 $ 2,076
Raw materials and work in process 618 617
Gross inventories 3,165 2,693
Less: excess of FIFO cost over LIFO cost (157) (160)
Total inventories $ 3,008 $ 2,533
Percentage of LIFO Inventory 46.00% 41.00%