Earnings Per Share (Details) (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
Schlumberger amounts attributable to:
Basic	$ 1,301	$ 1,734	$ 3,364	$ 3,224
Assumed conversion of debentures				3
Diluted	$ 1,301	$ 1,734	$ 3,364	$ 3,227
Average shares outstanding:
Basic	1,345	1,249	1,352	1,212
Assumed conversion of debentures				5
Assumed exercise of stock options	9	7	10	8
Unvested restricted stock	3	2	3	2
Assuming dilution	1,357	1,258	1,365	1,227
Earnings per Share
Basic	$ 0.97	$ 1.39	$ 2.49	$ 2.66
Diluted	$ 0.96	$ 1.38	$ 2.46	$ 2.63

Includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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