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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 1,332 $ 1,293
Work-in-process 612 576
Finished goods 5,138 4,857
Total Inventories $ 7,082 $ 6,726