Charges and Credits - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended					3 Months Ended		12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Other Restructuring USD ($)	Dec. 31, 2014 Venezuela Bolivar Official Currency Exchange Rate To Dollar VEF	Mar. 31, 2013 Venezuela Bolivar Official Currency Exchange Rate To Dollar VEF	Dec. 31, 2012 Venezuela Bolivar Official Currency Exchange Rate To Dollar VEF	Dec. 31, 2014 Venezuela Bolivar Official Currency Exchange Rate To Dollar SICAD I VEF	Dec. 31, 2014 Venezuela Bolivar Official Currency Exchange Rate To Dollar SICAD II USD ($)	Dec. 31, 2014 Venezuela Bolivar Official Currency Exchange Rate To Dollar SICAD II VEF	Dec. 31, 2013 Provision For Accounts Receivable Cost Of Revenue USD ($)	Dec. 31, 2013 Gain On Formation Of One Subsea Gain On Formation Of One Subsea Joint Venture USD ($)	Dec. 31, 2013 Impairment And Other Impairment Of Equity Method Investments USD ($)	Dec. 31, 2013 Impairment And Other Impairment Of Equity Method Investments Drilling Related Technology USD ($)	Dec. 31, 2013 Impairment And Other Impairment Of Equity Method Investments Contract Drilling USD ($)	Dec. 31, 2014 Impairment And Other Severance and other USD ($)	Dec. 31, 2012 Impairment And Other Severance and other USD ($)	Dec. 31, 2014 Certain intangible assets USD ($)	Dec. 31, 2012 Merger And Integration Merger-related integration costs USD ($)	Dec. 31, 2014 Explorer-class vessels USD ($)	Dec. 31, 2014 Explorer-class vessels Eastern Echo Holdings Plc. USD ($) Vessel	Dec. 31, 2014 Other seismic assets Lease termination costs USD ($)
Charges And Credits [Line Items]
Vessel termination, description		Three previous-generation acquisition vessels with lower towing capacity and higher operating costs will be converted to source vessels, allowing for the termination of two third-party source vessel leases and the retirement of two owned source vessels.
Impairment charge, Pretax	$ 199																		$ 85		$ 590	$ 590
Number of vessels acquired																						6
Restructuring, other pretax charge																							131
Exchange rate						6.3	6.3	4.3
Exchange rate, approximated									11		50
Charges, Pretax	296
Devaluation charge					92					472
Foreign currency transactions, description		Going forward, this change will result in a reduction in the US dollar reported amount of local currency denominated revenues, expenses and, consequently, income before taxes and net income. For example, if Schlumberger had applied an exchange rate of 50 Venezuelan Bolivares fuertes to the US dollar throughout 2014, it would have reduced Schlumberger earnings by approximately $0.08 per share.
Charges and credits, Pretax		1,773	(420)	161								152	(1,028)	364	222	142
Charges and credits, Net			(469)									122	(1,028)	345
Charges, Pretax		$ 1,773		$ 161													$ 296	$ 33		$ 128