CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement - CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME [Line Items]
Net income	$ 1,725	$ 1,427	$ 5,091	$ 4,147
Currency translation adjustments
Unrealized net change arising during the period	95	138	(139)	45
Marketable securities
Unrealized (loss) gain arising during the period	(25)		58
Derivatives
Net derivatives gain (loss) on hedge transactions (see Note 11)	76	142	(27)	(35)
Reclassification to net income of net realized (gain) loss (see Note 11)	(30)	(92)	15	58
Actuarial loss
Actuarial loss arising during the period	(18)	(14)	(23)	(35)
Amortization to net income of net actuarial loss (see Note 15)	73	51	224	137
Prior service cost
Amortization to net income of net prior service cost (see Note 15)	31	31	94	93
Income taxes on pension and other postretirement benefit plans	(9)	(8)	(40)	(31)
Comprehensive income	1,918	1,675	5,253	4,379
Comprehensive income attributable to noncontrolling interests	10	3	23	20
Comprehensive income attributable to Schlumberger	$ 1,908	$ 1,672	$ 5,230	$ 4,359