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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Finished products $ 1,638 $ 1,979
Raw materials and work in process 619 602
Gross inventories 2,257 2,581
Less: excess of FIFO cost over LIFO cost (128) (143)
Total inventories $ 2,129 $ 2,438
Percentage of LIFO Inventory 40.00% 43.00%