Summary of Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization And Summary Of Significant Accounting Policies [Line Items]
Transaction Losses of Hedging Activities	$ (67)	$ (24)	$ (37)
Trading Investments		194
Fixed Income Investments, held to maturity	442	363
Fixed Income Investments, held to maturity, 2016	49
Fixed Income Investments, held to maturity, 2017	91
Fixed Income Investments, held to maturity, 2018	298
Fixed Income Investments, held to maturity, 2019	3
Fixed Income Investments, held to maturity, 2020	1
Carrying value of marketable securities	81	81
Fair value of marketable securities	91	257
Employee stock options to purchase	5	12	21
Customer Relationships
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful life of intangible asset minimum	15 years
Useful life of intangible asset maximum	28 years
Technology/Technical Know-How
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful life of intangible asset minimum	10 years
Useful life of intangible asset maximum	18 years
Tradenames
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful life of intangible asset minimum	15 years
Useful life of intangible asset maximum	30 years
Schlumberger Production Management
Organization And Summary Of Significant Accounting Policies [Line Items]
Unamortized investments	$ 1,411	$ 1,154