Pension and Other Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Frequency of asset performance monitored, years	5 years
Expected contributions to postretirement benefit plans	$ 125
Expenses for deferred benefit programs	$ 413	$ 445	$ 565
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 | 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	41.00%
Postretirement medical plan | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Investment of assets in government and government-related debt securities under US postretirement medical plan	59.00%