Nasdaq Stockholders' Equity (Common Stock in Treasury) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Other repurchases of common stock
Dividends Payable [Line Items]
Number of shares of common stock repurchased (in shares)	307,668
Share repurchase program
Dividends Payable [Line Items]
Share repurchase program (in shares)	735,865
Average price paid per share (in dollars per share) | $ / shares	$ 191.91
Total purchase price (in millions) | $	$ 142