Nasdaq Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($) vote $ / shares shares	Mar. 31, 2021 $ / shares	Jan. 31, 2022 USD ($)	Dec. 31, 2021 vote $ / shares shares	Jun. 16, 2021 USD ($)
Stockholders Equity [Line Items]
Common stock, shares authorized (in shares)		300,000,000			300,000,000
Common stock, shares issued (in shares)		171,535,457			173,418,939
Common stock, shares outstanding (in shares)		164,488,485			166,679,635
Common stock (in votes per share) | vote		1			1
Common stock holder voting rights, maximum percentage of the then-outstanding shares of Nasdaq common stock		5.00%			5.00%
Common stock in treasury (in shares)		7,046,972			6,739,304
Additional amount under stock repurchase program | $						$ 1,500
Authorized amount under share repurchase program | $		$ 459
Preferred stock, shares authorized (in shares)		30,000,000			30,000,000
Preferred stock par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01
Preferred stock, shares issued (in shares)		0			0
Preferred stock, shares outstanding (in shares)		0			0
Payments of dividends | $		$ 89
Cash dividends declared per common share (in dollars per share) | $ / shares		$ 0.54	$ 0.49
Subsequent Event
Stockholders Equity [Line Items]
Cash dividends declared per common share (in dollars per share) | $ / shares	$ 0.60
Dividends declared | $	$ 99
Percentage increase of dividends declared	0.11
Stock split conversion ratio	3
Common stock | ASR agreement
Stockholders Equity [Line Items]
Authorized amount under share repurchase program | $				$ 325
Share repurchase program (in shares)		1,876,387