CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 988us-gaap_ProfitLoss	$ 1,608us-gaap_ProfitLoss
Currency translation adjustments
Unrealized net change arising during the period	(113)	(88)
Marketable securities
Unrealized (loss) gain arising during the period	(18)	11
Cash flow hedges
Net (loss) gain on cash flow hedges	(152)	16
Reclassification to net income of net realized loss (gain)	118	(3)
Actuarial loss
Amortization to net income of net actuarial loss	74	41
Prior service cost
Amortization to net income of net prior service cost	27	32
Income taxes on pension and other postretirement benefit plans	(15)	(10)
Comprehensive income	909	1,607
Comprehensive income attributable to noncontrolling interests	13	16
Comprehensive income attributable to Schlumberger	$ 896us-gaap_ComprehensiveIncomeNetOfTax	$ 1,591us-gaap_ComprehensiveIncomeNetOfTax

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