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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Chief Executive Officer Effective January 1, 2017, Adena T. Friedman became the President and Chief Executive Officer of Nasdaq. Asset Impairment On January 30, 2017, Nasdaq’s board of directors approved a pre-tax, non-cash intangible asset impairment charge of $578 million related to the full write-off of the eSpeed trade name. See “Intangible Asset Impairment Charges,” of Note 5, “Goodwill and Acquired Intangible Assets,” for further discussion. Nasdaq NLX On January 30, 2017, Nasdaq’s board of directors approved the decision to wind down Nasdaq NLX, our London-based multilateral trading venue.