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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 707 $ 726
Finished product 1,953 1,987
Inventories, gross 2,660 2,713
Inventory reserves (114) (121)
Inventories, net $ 2,546 $ 2,592