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Goodwill - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | $ 12,968 | $ 16,042 | $ 24,931
Impairment (see Note 3) |  | (3,070) | (8,828)
Impact of changes in exchange rates and other | 12 | (4) | (61)
Goodwill, Ending Balance | 12,980 | 12,968 | 16,042
Production Systems |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 854 |  |
Impact of changes in exchange rates and other | (1) |  |
Goodwill, Ending Balance | 853 | 854 |
Operating Segments | Reservoir Characterization |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 4,560 | 4,560 | 4,703
Impairment (see Note 3) |  |  | (97)
Impact of changes in exchange rates and other |  |  | (46)
Goodwill, Ending Balance |  | 4,560 | 4,560
Operating Segments | Drilling |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 5,443 | 7,092 | 10,111
Impairment (see Note 3) |  | (1,659) | (3,025)
Impact of changes in exchange rates and other |  | 10 | 6
Goodwill, Ending Balance |  | 5,443 | 7,092
Operating Segments | Production |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 2,704 | 3,949 | 4,678
Impairment (see Note 3) |  | (1,228) | (705)
Impact of changes in exchange rates and other |  | (17) | (24)
Goodwill, Ending Balance |  | 2,704 | 3,949
Operating Segments | Cameron |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 261 | 441 | 5,439
Impairment (see Note 3) |  | (183) | (5,001)
Impact of changes in exchange rates and other |  | 3 | 3
Goodwill, Ending Balance |  | 261 | $ 441
Operating Segments | Digital Integration |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 2,041 |  |
Impact of changes in exchange rates and other | 6 |  |
Goodwill, Ending Balance | 2,047 | 2,041 |
Operating Segments | Reservoir Performance |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 3,806 |  |
Impact of changes in exchange rates and other | (4) |  |
Goodwill, Ending Balance | 3,802 | 3,806 |
Operating Segments | Well Construction |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 6,267 |  |
Impact of changes in exchange rates and other | 11 |  |
Goodwill, Ending Balance | $ 6,278 | $ 6,267 |

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