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