Earnings Per Share (Summary of Computation of Basic and Diluted Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 385		$ 352		$ 387
Weighted-average common shares outstanding for basic earnings per share	166,932,103	[1]	168,254,653	[1]	176,331,819	[1]
Employee equity awards	3,969,766		4,317,577		3,644,946
Contingent issuance of common stock, shares	364,277	[2]
3.75% convertible notes			15,640	[3]	34,482	[3]
Weighted-average common shares outstanding for diluted earnings per share	171,266,146		172,587,870		180,011,247
Basic earnings per share	$ 2.30		$ 2.09		$ 2.20
Diluted earnings per share	$ 2.25		$ 2.04		$ 2.15

[1] The decrease in the weighted-average common shares outstanding for basic and diluted earnings per share primarily reflects the weighted-average impact of purchases related to our share repurchase programs made in 2013, 2012 and 2011. See “Share Repurchase Program,” of Note 13, “NASDAQ OMX Stockholders’ Equity,” for further discussion.

[2] See “Acquisition of eSpeed for Trading of U.S. Treasuries,” of Note 4, “Acquisition and Divestiture,” for further discussion.

[3] In June 2012, the remaining $0.5 million of our 3.75% convertible notes outstanding was converted into 34,482 shares of common stock in accordance with the terms of the notes.