Nasdaq Stockholders' Equity (Schedule of Dividends Declared) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 30, 2004		Mar. 27, 2004		Jul. 24, 2004		Oct. 24, 2004
Dividends Payable [Line Items]
Dividend Per Common Share	$ 0.58	$ 0.52	$ 0.39
Total Amount	$ 98	$ 87	$ 65
January 30, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date	Jan. 30, 2014
Dividend Per Common Share				$ 0.13
Record Date	Mar. 14, 2014
Total Amount				22	[1]
Payment Date	Mar. 28, 2014
March 27, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date	Mar. 27, 2014
Dividend Per Common Share						$ 0.15
Record Date	Jun. 13, 2014
Total Amount						25	[1]
Payment Date	Jun. 27, 2014
July 24, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date	Jul. 24, 2014
Dividend Per Common Share								$ 0.15
Record Date	Sep. 12, 2014
Total Amount								26	[1]
Payment Date	Sep. 26, 2014
October 24, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date	Oct. 24, 2014
Dividend Per Common Share										$ 0.15
Record Date	Dec. 12, 2014
Total Amount										$ 25	[1]
Payment Date	Dec. 26, 2014

[1] These amounts were recorded in retained earnings in the Consolidated Balance Sheets at December 31, 201