Pension and Other Benefit Plans - Fair Value of Schlumberger's Pension Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 4,058	$ 3,625	$ 3,467
US Plan Assets | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	112	60
US Plan Assets | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	757	662
US Plan Assets | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	771	625
US Plan Assets | Government and government-related debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	656	643
US Plan Assets | Collateralized mortgage obligations and mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	108	92
US Plan Assets | Private equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	183	191
US Plan Assets | Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	147	142
US Plan Assets | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	1,324	1,210
International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	8,507	7,194	$ 6,832
International | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	307	184
International | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	2,160	1,726
International | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	841	685
International | Government and government-related debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	985	1,001
International | Collateralized mortgage obligations and mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	150	130
International | Private equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	477	385
International | Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	168	106
International | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	133	123
International | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	3,286	2,854
Level One | US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	2,150	1,877
Level One | US Plan Assets | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	92	15
Level One | US Plan Assets | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	747	649
Level One | US Plan Assets | Government and government-related debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	163	164
Level One | US Plan Assets | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	1,148	1,049
Level One | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	4,593	3,944
Level One | International | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	69	135
Level One | International | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	1,871	1,475
Level One | International | Government and government-related debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	11	10
Level One | International | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	2,642	2,324
Level Two | US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	1,578	1,415
Level Two | US Plan Assets | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	20	45
Level Two | US Plan Assets | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	10	13
Level Two | US Plan Assets | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	771	625
Level Two | US Plan Assets | Government and government-related debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	493	479
Level Two | US Plan Assets | Collateralized mortgage obligations and mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	108	92
Level Two | US Plan Assets | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	176	161
Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	3,136	2,636
Level Two | International | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	238	49
Level Two | International | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	289	251
Level Two | International | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	841	685
Level Two | International | Government and government-related debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	974	991
Level Two | International | Collateralized mortgage obligations and mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	150	130
Level Two | International | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	644	530
Level Three | US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	330	333
Level Three | US Plan Assets | Private equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	183	191
Level Three | US Plan Assets | Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	147	142
Level Three | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	778	614
Level Three | International | Private equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	477	385
Level Three | International | Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	168	106
Level Three | International | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 133	$ 123