Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Schlumberger amounts attributable to:
Basic	$ 1,119	$ 818	$ 2,063	$ 1,490
Assumed conversion of debentures		1		3
Diluted	$ 1,119	$ 819	$ 2,063	$ 1,493
Average shares outstanding:
Basic	1,352	1,192	1,356	1,194
Assumed conversion of debentures		6		6
Assumed exercise of stock options	11	8	11	9
Unvested restricted stock	3	2	3	2
Assuming dilution	1,366	1,208	1,370	1,211
Earnings per Share
Basic	$ 0.83	$ 0.69	$ 1.52	$ 1.25
Diluted	$ 0.82	$ 0.68	$ 1.51	$ 1.23

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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