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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | $ 8,523,000,000 |
Charges and credits, Tax | (796,000,000) |
Charges and credits, Net | 7,727,000,000 | $ 0
Goodwill | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | 3,070,000,000 |
Charges and credits, Net | 3,070,000,000 |
Intangible Assets | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | 3,321,000,000 |
Charges and credits, Tax | (815,000,000) |
Charges and credits, Net | 2,506,000,000 |
APS investments | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | 1,264,000,000 |
Charges and credits, Tax | 4,000,000 |
Charges and credits, Net | 1,268,000,000 |
North America pressure pumping asset impairments | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | 587,000,000 |
Charges and credits, Tax | (133,000,000) |
Charges and credits, Net | 454,000,000 |
Severance | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | 202,000,000 |
Charges and credits, Tax | (7,000,000) |
Charges and credits, Net | 195,000,000 |
Other | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Pretax | 79,000,000 |
Charges and credits, Tax | (9,000,000) |
Charges and credits, Net | 70,000,000 |
Valuation allowance | Impairment and Other |  |
Charges And Credits [Line Items] |  |
Charges and credits, Tax | 164,000,000 |
Charges and credits, Net | $ 164,000,000 |

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