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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  |  | $ 12,692,000,000 |  |
Charges and credits, Tax |  |  |  | (713,000,000) |  |
Charges and credits, Net |  |  |  | 11,979,000,000 | $ 0 |
Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | $ 40,000,000 | $ 3,321,000,000 |  |  | $ 12,596,000,000
Charges and credits, Tax |  | (2,000,000) | (815,000,000) |  |  | (1,057,000,000)
Charges and credits, Net |  | 38,000,000 | 2,506,000,000 |  |  | $ 11,539,000,000
Goodwill | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  | 3,070,000,000 | 8,828,000,000 |  |
Charges and credits, Tax |  |  |  | (43,000,000) |  |
Charges and credits, Net |  |  | 3,070,000,000 | 8,785,000,000 |  |
Asset Performance Solutions Investments | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | 730,000,000 | 1,264,000,000 | 294,000,000 |  |
Charges and credits, Tax |  | (15,000,000) | 4,000,000 |  |  |
Charges and credits, Net |  | 715,000,000 | 1,268,000,000 | 294,000,000 |  |
North America pressure pumping asset impairments | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  | 587,000,000 | 1,575,000,000 |  |
Charges and credits, Tax |  |  | (133,000,000) | (344,000,000) |  |
Charges and credits, Net |  |  | 454,000,000 | 1,231,000,000 |  |
Workforce reductions | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax | $ 63,000,000 | 1,021,000,000 | 202,000,000 |  |  |
Charges and credits, Tax |  | (71,000,000) | (7,000,000) |  |  |
Charges and credits, Net | 63,000,000 | 950,000,000 | 195,000,000 |  |  |
Other | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax | 33,000,000 | 60,000,000 | 79,000,000 | 242,000,000 |  |
Charges and credits, Tax | (1,000,000) | (4,000,000) | (9,000,000) | (13,000,000) |  |
Charges and credits, Net | 32,000,000 | 56,000,000 | 70,000,000 | 229,000,000 |  |
Valuation allowance | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Tax |  |  | 164,000,000 |  |  |
Charges and credits, Net |  |  | $ 164,000,000 |  |  |
Fixed Asset Impairments | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | 666,000,000 |  |  |  |
Charges and credits, Tax |  | (52,000,000) |  |  |  |
Charges and credits, Net |  | 614,000,000 |  |  |  |
Inventory Write Down | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | 603,000,000 |  |  |  |
Charges and credits, Tax |  | (49,000,000) |  |  |  |
Charges and credits, Net |  | 554,000,000 |  |  |  |
Right-of-use Asset Impairments | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | 311,000,000 |  |  |  |
Charges and credits, Tax |  | (67,000,000) |  |  |  |
Charges and credits, Net |  | 244,000,000 |  |  |  |
Costs Associated With Exiting Certain Activities | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | 205,000,000 |  |  |  |
Charges and credits, Tax |  | 25,000,000 |  |  |  |
Charges and credits, Net |  | 230,000,000 |  |  |  |
Multiclient Seismic Data Impairment | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | 156,000,000 |  |  |  |
Charges and credits, Tax |  | (2,000,000) |  |  |  |
Charges and credits, Net |  | 154,000,000 |  |  |  |
Postretirement Benefits Curtailment Gain | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  | (69,000,000) |  |  |  |
Charges and credits, Tax |  | 16,000,000 |  |  |  |
Charges and credits, Net |  | $ (53,000,000) |  |  |  |
Facility exit charges | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax | 254,000,000 |  |  |  |  |
Charges and credits, Tax | (39,000,000) |  |  |  |  |
Charges and credits, Net | $ 215,000,000 |  |  |  |  |
Intangible Assets | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  |  | 1,085,000,000 |  |
Charges and credits, Tax |  |  |  | (248,000,000) |  |
Charges and credits, Net |  |  |  | 837,000,000 |  |
Other North America - Related | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  |  | 310,000,000 |  |
Charges and credits, Tax |  |  |  | (53,000,000) |  |
Charges and credits, Net |  |  |  | 257,000,000 |  |
Argentina | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  |  | 127,000,000 |  |
Charges and credits, Net |  |  |  | 127,000,000 |  |
Equity Method Investment, Other Than Temporary Impairment | Impairment and Other |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |
Charges and credits, Pretax |  |  |  | 231,000,000 |  |
Charges and credits, Tax |  |  |  | (12,000,000) |  |
Charges and credits, Net |  |  |  | $ 219,000,000 |  |

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