Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common stock	Additional paid-in capital	Common stock in treasury, at cost	Accumulated other comprehensive loss	Retained earnings	Retained earnings Cumulative effect, period of adoption	Total Nasdaq stockholders’ equity	Noncontrolling interests
Beginning balance, stockholders' equity at Dec. 31, 2018			$ 2,716	$ (297)	$ (1,530)	$ 4,558			$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares repurchase program (in shares)			(2)
Share repurchase program	$ (200)		$ (200)
Share-based compensation			$ 57
Share-based compensation (in shares)			1
Stock option exercises, net			$ 1
Other issuances of common stock, net			11
Other employee stock activity				(31)
Other comprehensive income (loss)					(303)
Net income	$ 571					571
Cash dividends declared per common share						(228)
Ending balance (in shares) at Sep. 30, 2019	164	165
Ending balance, stockholders' equity at Sep. 30, 2019	$ 5,327	$ 2	2,585	(328)	(1,833)	4,901		$ 5,327	0
Beginning balance, stockholders' equity at Dec. 31, 2018			2,716	(297)	(1,530)	4,558			0
Ending balance, stockholders' equity at Dec. 31, 2019	$ 5,639		2,632	(336)	(1,686)	5,027	$ (12)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Jun. 30, 2019		165
Beginning balance, stockholders' equity at Jun. 30, 2019			$ 2,713	(327)	(1,666)	4,829			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares repurchase program (in shares)			(2)
Share repurchase program			$ (150)
Share-based compensation			$ 21
Share-based compensation (in shares)			1
Stock option exercises, net			$ 1
Other employee stock activity				(1)
Other comprehensive income (loss)					(167)
Net income	$ 150					150
Cash dividends declared per common share						(78)
Ending balance (in shares) at Sep. 30, 2019	164	165
Ending balance, stockholders' equity at Sep. 30, 2019	$ 5,327	$ 2	2,585	(328)	(1,833)	4,901		5,327	0
Beginning balance, stockholders' equity at Dec. 31, 2019	5,639		$ 2,632	(336)	(1,686)	5,027	$ (12)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares repurchase program (in shares)			(2)
Share repurchase program	(186)		$ (186)
Share-based compensation			$ 64
Share-based compensation (in shares)			1
Stock option exercises, net			$ 2
Other issuances of common stock, net			12
Other employee stock activity				(31)
Other comprehensive income (loss)					54
Net income	708					708
Cash dividends declared per common share	$ (239)					(239)
Net activity related to noncontrolling interests									3
Ending balance (in shares) at Sep. 30, 2020	164	165
Ending balance, stockholders' equity at Sep. 30, 2020	$ 6,014	$ 2	2,524	(367)	(1,632)	5,484		6,011	3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Jun. 30, 2020		164
Beginning balance, stockholders' equity at Jun. 30, 2020			2,533	(367)	(1,715)	5,301			3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchase program			(34)
Share-based compensation			24
Stock option exercises, net			1
Other comprehensive income (loss)					83
Net income	$ 264					264
Cash dividends declared per common share						(81)
Ending balance (in shares) at Sep. 30, 2020	164	165
Ending balance, stockholders' equity at Sep. 30, 2020	$ 6,014	$ 2	$ 2,524	$ (367)	$ (1,632)	$ 5,484		$ 6,011	$ 3