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Pension and Other Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefits Paid |  | $ 257 |
Non-cash settlement charge | $ 37 | 37 |
Fair value of excess of plan assets, projected benefit obligation |  | 8,300 |
Projected benefit obligation plan assets |  | 9,400 |
Accumulated benefit obligation plan assets |  | $ 9,100 |
Frequency of asset performance monitored, years |  | 5 years |
Expected contributions to postretirement benefit plans |  | $ 20 |
Impact of curtailment |  | $ (69) |
US Employees Postretirement Benefits Other Than Pensions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retirement coverage plan, description |  | Effective April 1, 2015, Schlumberger changed the way it provides healthcare coverage to certain retirees who are age 65 and over. Under the amended plan, these retirees transferred to individual coverage under the Medicare Exchange. Schlumberger subsidizes the cost of the program by providing these retirees with a Health Reimbursement Account. The annual subsidy may be increased based on medical cost inflation, but it will not be increased by more than 5% in any given year. |
US Employees Postretirement Benefits Other Than Pensions | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Compensation increases |  | 5.00% |
Postretirement medical plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefits Paid |  | $ 58 | $ 60
Impact of curtailment |  | 69 |
Asset (Unfunded Liability) | $ (8) | $ 122 | $ (8)
Postretirement medical plan | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment of assets in government and government-related debt securities under US postretirement medical plan |  | 61.00% |
Postretirement medical plan | Government and government-related debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment of assets in government and government-related debt securities under US postretirement medical plan |  | 39.00% |
Postretirement medical plan | Impairment and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Impact of curtailment |  | $ 69 |

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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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