CONSOLIDATED STATEMENT OF INCOME (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue
Revenue	$ 10,229	$ 6,845	$ 28,566	$ 18,379
Interest & other income	34	54	94	169
Gain on investment in M-I SWACO	0	1,270	0	1,270
Cost of Revenue:
Research & engineering	266	240	800	662
General & administrative	91	75	326	221
Merger & integration	27	97	93	131
Restructuring & other	0	299	0	299
Interest	70	47	212	146
Income from Continuing Operations before taxes	1,717	1,940	4,453	3,822
Taxes on income	410	209	1,079	600
Income from Continuing Operations	1,307	1,731	3,374	3,222
Income from Discontinued Operations	0		220
Net Income	1,307	1,731	3,594	3,222
Net income (loss) attributable to noncontrolling interests	6	(3)	10	(2)
Net Income attributable to Schlumberger	1,301	1,734	3,584	3,224
Schlumberger amounts attributable to:
Income from Continuing Operations	1,301	1,734	3,364	3,224
Income from Discontinued Operations	0		220
Net Income	1,301	1,734	3,584	3,224
Basic earnings per share of Schlumberger:
Income from Continuing Operations	$ 0.97	$ 1.39	$ 2.49	$ 2.66
Income from Discontinued Operations	$ 0		$ 0.16
Net Income	$ 0.97	$ 1.39	$ 2.65	$ 2.66
Diluted earnings per share of Schlumberger:
Income from Continuing Operations	$ 0.96	$ 1.38	$ 2.46	$ 2.63
Income from Discontinued Operations	$ 0		$ 0.16
Net Income	$ 0.96	$ 1.38	$ 2.62	$ 2.63
Average shares outstanding:
Basic	1,345	1,249	1,352	1,212
Assuming dilution	1,357	1,258	1,365	1,227
Oilfield Services [Member]
Revenue
Revenue	9,546	6,646	26,658	18,180
Cost of Revenue:
Cost of revenue	7,440	5,281	20,945	14,346
Distribution [Member]
Revenue
Revenue	683	199	1,908	199
Cost of Revenue:
Cost of revenue	$ 652	$ 190	$ 1,831	$ 190