CONSOLIDATED STATEMENT OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Revenue	$ 42,149		$ 36,959		$ 26,672
Interest and other income	172		130		215
Gain on investment in M-I SWACO					1,270
Expenses
Cost of revenue	33,056		28,939		21,097
Research & engineering	1,168		1,073		919
General & administrative	405		427		311
Merger & integration	128		113		160
Restructuring & other	33				331
Interest	340		298		207
Income from continuing operations before taxes	7,191		6,239		5,132
Taxes on income	1,723		1,509		879
Income from continuing operations	5,468		4,730		4,253
Income from discontinued operations	51		277		12
Net income	5,519		5,007		4,265
Net income (loss) attributable to noncontrolling interests	29		10		(2)
Net income attributable to Schlumberger	5,490		4,997		4,267
Schlumberger amounts attributable to:
Income from continuing operations	5,439		4,720		4,255
Income from discontinued operations	51		277		12
Net income attributable to Schlumberger	$ 5,490		$ 4,997		$ 4,267
Basic earnings per share of Schlumberger:
Income from continuing operations	$ 4.09		$ 3.50		$ 3.40
Income from discontinued operations	$ 0.04		$ 0.21		$ 0.01
Net income	$ 4.13	[1]	$ 3.70	[1]	$ 3.41	[1]
Diluted earnings per share of Schlumberger:
Income from continuing operations	$ 4.06		$ 3.47		$ 3.37
Income from discontinued operations	$ 0.04		$ 0.20		$ 0.01
Net income	$ 4.10		$ 3.67		$ 3.38
Average shares outstanding:
Basic	1,330		1,349		1,250
Assuming dilution	1,339		1,361		1,263

[1] Amounts may not add due to rounding.