CONSOLIDATED STATEMENT OF INCOME (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue
Revenue	$ 10,611	$ 8,716
Interest and other income	47	31
Cost of Revenue
Research & engineering	275	254
General & administrative	93	93
Merger & integration	15	34
Interest	80	73
Income before taxes	1,721	1,238
Taxes on income	411	295
Net income	1,310	943
Net income (loss) attributable to noncontrolling interests	9	(1)
Net income attributable to Schlumberger	1,301	944
Basic earnings per share of Schlumberger	$ 0.98	$ 0.69
Diluted earnings per share of Schlumberger	$ 0.97	$ 0.69
Average shares outstanding:
Basic	1,334	1,360
Assuming dilution	1,344	1,375
Oilfield Services [Member]
Revenue
Revenue	9,918	8,122
Cost of Revenue
Cost of revenue	7,816	6,483
Distribution [Member]
Revenue
Revenue	693	594
Cost of Revenue
Cost of revenue	$ 658	$ 572