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Inventories - Summary of Inventory (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials & field materials $ 1,677 $ 1,857
Work in progress 481 515
Finished goods 1,443 1,758
Inventories $ 3,601 $ 4,130