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Inventories - Summary of Inventory (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials & field materials $ 1,857 $ 1,803
Work in progress 515 519
Finished goods 1,758 1,688
Inventories $ 4,130 $ 4,010