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Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Stockholders' Equity [Member]	Non-controlling Interests [Member]	Total
Balance at Dec. 31, 2018	$ 1	$ 898	$ (3)	$ 390	$ (4)	$ 1,282	$ 5,874	$ 7,156
Balance (in shares) at Dec. 31, 2018	75,230,400
Common Stock distributed pursuant to stock incentive plans (in shares)	905
Compensation for stock grants vesting in the future		3				3	13	16
Dividends paid to stockholders				(8)		(8)		(8)
Distributions from IBG LLC to noncontrolling interests							(60)	(60)
Comprehensive income				49	(1)	48	274	322
Balance at Mar. 31, 2019	$ 1	901	(3)	431	(5)	1,325	6,101	7,426
Balance (in shares) at Mar. 31, 2019	75,231,305
Common Stock distributed pursuant to stock incentive plans (in shares)	1,625,479
Compensation for stock grants vesting in the future		2				2	12	14
Repurchase of common stock for employee tax withholding under stock incentive plans			(27)			(27)		(27)
Sales of treasury stock			27			27	(1)	26
Dividends paid to stockholders				(7)		(7)		(7)
Distributions from IBG LLC to noncontrolling interests							(38)	(38)
Adjustments for changes in proportionate ownership in IBG LLC		24				24	(24)
Comprehensive income				32	4	36	190	226
Balance at Jun. 30, 2019	$ 1	927	(3)	456	(1)	1,380	6,240	7,620
Balance (in shares) at Jun. 30, 2019	76,856,784
Balance at Dec. 31, 2019	$ 1	934	(3)	520		1,452	6,488	7,940
Balance (in shares) at Dec. 31, 2019	76,889,040
Common Stock distributed pursuant to stock incentive plans (in shares)	311
Compensation for stock grants vesting in the future		3				3	13	16
Dividends paid to stockholders				(8)		(8)		(8)
Distributions from IBG LLC to noncontrolling interests							(53)	(53)
Comprehensive income				46	(7)	39	213	252
Balance at Mar. 31, 2020	$ 1	937	(3)	558	(7)	1,486	6,661	8,147
Balance (in shares) at Mar. 31, 2020	76,889,351
Common Stock distributed pursuant to stock incentive plans (in shares)	1,297,716
Compensation for stock grants vesting in the future		2				2	11	13
Repurchase of common stock for employee tax withholding under stock incentive plans			(17)			(17)		(17)
Sales of treasury stock			17			17	1	18
Dividends paid to stockholders				(7)		(7)		(7)
Distributions from IBG LLC to noncontrolling interests							(129)	(129)
Adjustments for changes in proportionate ownership in IBG LLC		21				21	(21)
Comprehensive income				32	4	36	193	229
Balance at Jun. 30, 2020	$ 1	$ 960	$ (3)	$ 583	$ (3)	$ 1,538	$ 6,716	$ 8,254
Balance (in shares) at Jun. 30, 2020	78,187,067

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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