Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Reconciliation of Earnings Per Share

							(Stated in millions, except per share amounts)
	2012						2011
	Schlumberger Income from Continuing Operations		Average Shares Outstanding		Earnings per Share from Continuing Operations		Schlumberger Income from Continuing Operations		Average Shares Outstanding		Earnings per Share from Continuing Operations
First Quarter
Basic	$	1,301		1,334	$	0.98	$	944		1,360	$	0.69
Assumed exercise of stock options		—		7				—		13
Unvested restricted stock		—		3				—		2
Diluted	$	1,301		1,344	$	0.97	$	944		1,375	$	0.69

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

	(Stated in millions)
	2012		2011
First Quarter		14		1