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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 718 $ 707
Finished product 2,059 1,953
Inventories, gross 2,777 2,660
Inventory reserves (130) (114)
Inventories, net $ 2,647 $ 2,546