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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Finished products $ 1,979 $ 2,076
Raw materials and work in process 602 617
Gross inventories 2,581 2,693
Less: excess of FIFO cost over LIFO cost (143) (160)
Total inventories $ 2,438 $ 2,533
Percent of LIFO Inventory 43.00% 41.00%