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Inventories - Summary of Inventory (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Raw materials & field materials | $ 1,545 | $ 1,573
Work in progress | 483 | 464
Finished goods | 1,275 | 1,317
Inventories | $ 3,303 | $ 3,354

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