Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Common Share [Abstract]

Schedule Of The Computation Of Basic And Diluted Earnings Per Share

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
	(in millions, except share and per share amounts)
Numerator:
Net income attributable to NASDAQ OMX	$	110	$	101	$	306	$	258
Accretion of series A convertible preferred stock		—		—		—		(1	)
Net income attributable to common shareholders	$	110	$	101	$	306	$	257
Denominator:
Weighted-average common shares outstanding for basic earnings per share(1)		177,097,281		200,115,483		176,616,419		205,558,649
Weighted-average effect of dilutive securities:
Employee equity awards		3,792,679		3,922,926		3,666,109		3,611,480
3.75% convertible notes assumed converted into common stock		34,482		34,482		34,482		34,482
Weighted-average common shares outstanding for diluted earnings per share(1)		180,924,442		204,072,891		180,317,010		209,204,611
Basic and diluted earnings per share:
Basic earnings per share	$	0.62	$	0.51	$	1.73	$	1.25
Diluted earnings per share	$	0.61	$	0.50	$	1.70	$	1.23

⁽¹⁾  The decrease in the weighted-average common shares outstanding for basic and diluted earnings per share primarily reflects the weighted-average impact of the share repurchase from Borse Dubai and other purchases related to our share repurchase program completed in 2010. See "Share Repurchase Programs and Share Repurchase from Borse Dubai," of Note 12, "NASDAQ OMX Stockholders' Equity," for further discussion.