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Asset Impairments - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 Reporting_Unit | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Decrease in trade percentage |  |  |  |  | 14.00% |  |
Impairment charge on goodwill | $ 410 |  | $ 3,099 |  | $ 3,509 |  |
Impairment of intangible assets, indefinite-lived (excluding goodwill) | 16 |  | 87 |  |  |  |
Goodwill | 2,807 |  |  | $ 2,807 | $ 2,807 | $ 6,264 | $ 6,227
Impairment of Intangible Assets, Finite-lived |  |  | 1,901 | 22 |  |  |
Impairment of property, plant and equipment |  |  | 230 |  |  |  |
Impairment of right-of-use assets |  |  | $ 56 |  |  |  |
Estimated useful lives of intangible assets, minimum |  |  |  |  | 2 years |  |
Estimated useful lives of intangible assets, maximum |  |  |  |  | 30 years |  |
Amortization expense, 2019 | 61 |  |  | 61 | $ 61 |  |
Amortization expense, 2020 | 57 |  |  | 57 | 57 |  |
Amortization expense, 2021 | 55 |  |  | 55 | 55 |  |
Amortization expense, 2022 | 48 |  |  | 48 | 48 |  |
Amortization expense, 2023 | 43 |  |  | 43 | 43 |  |
Intangibles, net | 852 |  |  | 852 | 852 | 3,020 |
M/D Totco [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | 63 |  |  | 63 | 63 |  |
PFT [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | 407 |  |  | 407 | 407 |  |
Wellbore Technologies [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Impairment charge on goodwill |  |  |  |  | 2,178 |  |
Reporting units reorganized | Reporting_Unit |  | 2 |  |  |  |  |
Goodwill | 843 |  |  | 843 | 843 | 3,011 | 2,956
Impairment of property, plant and equipment |  |  |  | 5 |  |  |
Wellbore Technologies [Member] | Downhole [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | 124 |  |  | 124 | 124 |  |
Wellbore Technologies [Member] | ReedHycalog [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | 358 |  |  | 358 | 358 |  |
Wellbore Technologies [Member] | Grant Prideco [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | 125 |  |  | 125 | 125 |  |
Rig Technologies [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Impairment charge on goodwill |  |  |  |  | 312 |  |
Goodwill | 910 |  |  | 910 | 910 | 1,212 | 1,149
Impairment of property, plant and equipment |  |  |  | 10 |  |  |
Rig Technologies [Member] | Marine Construction [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | 57 |  |  | 57 | 57 |  |
Completion & Production Solutions [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Impairment charge on goodwill |  |  |  |  | 1,019 |  |
Goodwill | 1,054 |  |  | 1,054 | 1,054 | $ 2,041 | $ 2,122
Impairment of property, plant and equipment |  |  |  | 7 |  |  |
Completion & Production Solutions [Member] | Completion Tools [Member] |  |  |  |  |  |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |  |
Goodwill | $ 20 |  |  | $ 20 | $ 20 |  |

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