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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Finished products $ 1,708 $ 1,979
Raw materials and work in process 627 602
Gross inventories 2,335 2,581
Less: excess of FIFO cost over LIFO cost (119) (143)
Total inventories $ 2,216 $ 2,438
Percentage of LIFO Inventory 41.00% 43.00%