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Inventories - Summary of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 1,525 $ 1,332
Work-in-process 622 612
Finished goods 3,875 5,138
Total Inventories $ 6,022 $ 7,082