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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 812 $ 718
Finished product 2,239 2,059
Inventories, gross 3,051 2,777
Inventory reserves (126) (130)
Inventories, net $ 2,925 $ 2,647