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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, 2015	$ 1	$ 718	$ (3)	$ 145	$ 2	$ 863	$ 4,481	$ 5,344
Balance (in shares) at Dec. 31, 2015	64,121,150
Issuance of common stock in follow-on offering		22				22	(22)
Issuance of common stock in follow-on offering (in shares)	1,596,200
Common Stock distributed pursuant to stock incentive plans (in shares)	2,402,062
Compensation for stock grants vesting in the future		8				8	43	51
Deferred tax benefit retained - follow-on offering		2				2		2
Repurchase of common stock for employee tax withholding under stock incentive plans			(26)			(26)		(26)
Sales of treasury stock			26			26	(1)	25
Dividends paid to stockholders				(26)		(26)		(26)
Distributions from IBG LLC to noncontrolling interests							(224)	(224)
Adjustments for changes in proportionate ownership in IBG LLC		25				25	(25)
Comprehensive Income				84	(4)	80	594	674
Balance at Dec. 31, 2016	$ 1	775	(3)	203	(2)	974	4,846	5,820
Balance (in shares) at Dec. 31, 2016	68,119,412
Issuance of common stock in follow-on offering		18				18	(18)
Issuance of common stock in follow-on offering (in shares)	1,214,860
Common Stock distributed pursuant to stock incentive plans (in shares)	2,274,777
Compensation for stock grants vesting in the future		9				9	44	53
Deferred tax benefit retained - follow-on offering		2				2		2
Repurchase of common stock for employee tax withholding under stock incentive plans			(21)			(21)		(21)
Sales of treasury stock			21			21		21
Dividends paid to stockholders				(28)		(28)		(28)
Distributions from IBG LLC to noncontrolling interests							(272)	(272)
Adjustments for changes in proportionate ownership in IBG LLC		28				28	(28)
Comprehensive Income				76	11	87	771	858
Balance at Dec. 31, 2017	$ 1	832	(3)	251	9	1,090	5,343	$ 6,433
Balance (in shares) at Dec. 31, 2017	71,609,049
Issuance of common stock in follow-on offering		25				25	(25)
Issuance of common stock in follow-on offering (in shares)	1,537,727							1,537,727
Common Stock distributed pursuant to stock incentive plans (in shares)	2,083,624
Compensation for stock grants vesting in the future		10				10	48	$ 58
Deferred tax benefit retained - follow-on offering		3				3		3
Repurchase of common stock for employee tax withholding under stock incentive plans			(45)			(45)		(45)
Sales of treasury stock			45	(1)		44	(4)	40
Dividends paid to stockholders				(29)		(29)		(29)
Distributions from IBG LLC to noncontrolling interests							(350)	(350)
Adjustments for changes in proportionate ownership in IBG LLC		28				28	(28)
Comprehensive Income				169	(13)	156	890	1,046
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

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