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Charges and Credits - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) Unit | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) Emp | Mar. 31, 2020 USD ($) Unit | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit | 17 |  |  | 11 |  |  |  |
Goodwill |  |  |  | $ 16,000,000,000.0 |  |  |  |
Goodwill impairment charge |  |  |  | $ 3,100,000,000 |  |  |  |
Goodwill | $ 25,000,000,000.0 | $ 12,968,000,000 |  |  |  |  |  | $ 16,042,000,000
Expected increase/decrease in discount rate assumption |  |  |  | 0.50% |  |  |  |
Number of reporting units fair value to be impacted | Unit |  |  |  | 7 |  |  |  |
Intangible assets | 1,085,000,000.000 |  |  | $ 3,300,000,000 |  |  |  |
Restructuring and asset impairment charges |  |  | $ 40,000,000 |  |  |  |  |
Expected increase in discount rate assumption |  |  |  |  | 0.50% |  |  |
Increase in goodwill impairment charge |  |  |  |  | $ 300,000,000 |  |  |
Expected decrease in discount rate assumption |  |  |  |  | 0.50% |  |  |
Decrease in goodwill impairment charge |  |  |  |  | $ 400,000,000 |  |  |
Charges And Credits |  |  |  |  | 11,979,000,000 | $ 0 |  |
North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 243,000,000 |  |  |  |  |  |  |
Carrying Value Of Impaired Intangible Asset |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 900,000,000 |  |  |  |
Carrying Value Of Impaired Intangible Asset | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 1,300,000,000 |  |  |  |
North America pressure pumping asset impairments | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 1,575,000,000 |  |  | 600,000,000 |  |  |  |
Severance |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 13,000,000 |  |  | 202,000,000 |  |  | $ 62,000,000 |
Severance | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 10,000,000 |  |  |  |  |  |  |
Severance | Argentina |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 29,000,000 |  |  |
Other Restructuring |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 79,000,000 |  |  | 45,000,000 |
Valuation allowance | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 164,000,000 |  |  |  |
Asset Performance Solutions Investments | Latin America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 730,000,000 |  |  |  |  |
Fixed Asset Impairments |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 666,000,000 |  |  |  |  |
Fixed Asset Impairments | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 230,000,000 |  |  |  |  |  |  |
Inventory Write Down |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 603,000,000 |  |  |  |  |
Inventory Write Down | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 70,000,000 |  |  |  |  |  |  |
Right-of-use Asset Impairments |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 311,000,000 |  |  |  |  |
Costs Associated With Exiting Certain Activities |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 205,000,000 |  |  |  |  |
Multiclient Seismic Data Impairment |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 156,000,000 |  |  |  |  |
Allowance For Doubtful Accounts |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 42,000,000 |  |  |  |  |
Postretirement Benefits Curtailment Gain |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | 69,000,000 |  |  |  |  |
Facility Exit Costs |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  | 254,000,000 |  |  |  |  |  |
Workforce reductions |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | $ 1,021,000,000.000 |  |  |  |  |
Reduction in workforce | Emp |  |  | 21,000 |  |  |  |  |
Restructuring charges |  | 63,000,000 |  |  |  |  |  |
Other |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Restructuring and asset impairment charges |  |  | $ 60,000,000 |  |  |  |  |
Restructuring charges |  | $ 33,000,000 |  |  |  |  |  |
Charges of Pressure Pumping Equipment |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 1,324,000,000 |  |  |  |  |  |  |
Operating Lease Right-of-use Asset |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 98,000,000 |  |  |  |  |  |  |
Supplies Expense |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 121,000,000 |  |  |  |  |  |  |
Inventory Charges |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 19,000,000 |  |  |  |  |  |  |
Charges Related to Other Businesses | North America |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | 310,000,000 |  |  |  |  |  |  |
Production Related Impairment or Charges | Argentina |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 127,000,000 |  |  |
Asset Impairment Charges | Argentina |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 72,000,000 |  |  |
Devaluation Charge | Argentina |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 26,000,000 |  |  |
Equity Method Investment, Other Than Temporary Impairment |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 231,000,000 |
Carrying Value of APS |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 294,000,000 |
Restructuring Charges |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 242,000,000 |
Acceleration of Stock-based Compensation Expense Associated With Certain Individuals |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 57,000,000 |
Business Divestiture Costs |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 49,000,000 |
Debt Instrument Premium Paid on Repurchase |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 29,000,000 |
Cameron |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 2,200,000,000 |  |  |  |
Smith International Inc Smith Aand Geoservices |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 842,000,000 |  |  | $ 1,100,000,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Discount rate utilized |  |  |  | 12.00% | 12.50% |  |  |
Maximum |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Discount rate utilized |  |  |  | 13.50% | 14.00% |  |  |
Expected percentage change in fair value of reporting units |  |  |  | 5.00% |  |  |  |
Four Reporting Units [Member] |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit |  |  |  | 4 |  |  |  |
Goodwill |  |  |  | $ 4,500,000,000 |  |  |  |
Seven Reporting Units [Member] |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit | 7 |  |  | 7 |  |  |  |
Goodwill |  |  |  | $ 11,500,000,000 |  |  |  |
Goodwill | $ 13,800,000,000 |  |  |  |  |  |  |
Six Reporting Units |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit |  |  |  | 6 |  |  |  |
Goodwill |  |  |  | $ 8,400,000,000 |  |  |  |
Six Reporting Units | Minimum |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | 200,000,000 |  |  |  |
Six Reporting Units | Maximum |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 5,000,000,000.0 |  |  |  |
Ten Reporting Units |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit | 10 |  |  |  |  |  |  |
Goodwill | $ 11,200,000,000 |  |  |  |  |  |  |
Nine Reporting Units |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit | 9 |  |  |  |  |  |  |
Goodwill impairment charge | $ 8,800,000,000 |  |  |  |  |  |  |
Three Reporting Units |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit | 3 |  |  |  |  |  |  |
Goodwill | $ 1,500,000,000 |  |  |  |  |  |  |
Three Reporting Units | Minimum |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Goodwill | 400,000,000 |  |  |  |  |  |  |
Three Reporting Units | Maximum |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 600,000,000 |  |  |  |  |  |  |
Tenth Reporting Unit |  |  |  |  |  |  |  |
Charges And Credits [Line Items] |  |  |  |  |  |  |  |
Total number of reporting units | Unit | 10 |  |  |  |  |  |  |
Goodwill | $ 900,000,000 |  |  |  |  |  |  |

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