Pension and Other Benefit Plans - Fair Value of Schlumberger's Pension Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	$ 3,549	$ 3,269	$ 2,910
US Plan Assets | Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	59	77
US Plan Assets | International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	552	572
US Plan Assets | Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	654	548
US Plan Assets | Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	735	639
US Plan Assets | Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	107	99
US Plan Assets | Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	210	204
US Plan Assets | Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	83	62
US Plan Assets | United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,149	1,068
US Plan Assets | Level One
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,270	1,264
US Plan Assets | Level One | Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	40	24
US Plan Assets | Level One | International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	433	454
US Plan Assets | Level One | Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	175	161
US Plan Assets | Level One | United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	622	625
US Plan Assets | Level Two
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,986	1,739
US Plan Assets | Level Two | Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	19	53
US Plan Assets | Level Two | International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	119	118
US Plan Assets | Level Two | Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	654	548
US Plan Assets | Level Two | Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	560	478
US Plan Assets | Level Two | Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	107	99
US Plan Assets | Level Two | United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	527	443
US Plan Assets | Level Three
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	293	266
US Plan Assets | Level Three | Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	210	204
US Plan Assets | Level Three | Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	83	62
International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	6,830	6,246	5,120
International | Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	264	267
International | International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,534	1,566
International | Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	780	576
International | Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,181	997
International | Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	256	301
International | Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	246	206
International | Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	49	60
International | Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	88	98
International | United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	2,432	2,175
International | Level One
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	2,986	2,726
International | Level One | Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	174	127
International | Level One | International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,047	990
International | Level One | Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	8	6
International | Level One | United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,757	1,603
International | Level Two
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	3,461	3,156
International | Level Two | Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	90	140
International | Level Two | International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	487	576
International | Level Two | Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	780	576
International | Level Two | Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,173	991
International | Level Two | Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	256	301
International | Level Two | United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	675	572
International | Level Three
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	383	364
International | Level Three | Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	246	206
International | Level Three | Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	49	60
International | Level Three | Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	$ 88	$ 98