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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, 2017	$ 1	$ 832	$ (3)	$ 251	$ 9	$ 1,090	$ 5,343	$ 6,433
Balance (in shares) at Dec. 31, 2017	71,609,049
Common Stock distributed pursuant to stock incentive plans (in shares)	1,532
Compensation for stock grants vesting in the future		2				2	12	14
Dividends paid to stockholders				(7)		(7)		(7)
Distributions from IBG LLC to noncontrolling interests							(61)	(61)
Comprehensive Income				46	1	47	280	327
Balance at Mar. 31, 2018	$ 1	834	(3)	290	10	1,132	5,574	6,706
Balance (in shares) at Mar. 31, 2018	71,610,581
Common Stock distributed pursuant to stock incentive plans (in shares)	2,063,810
Compensation for stock grants vesting in the future		3				3	12	15
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				(7)		(7)		(7)
Distributions from IBG LLC to noncontrolling interests							(189)	(189)
Adjustments for changes in proportionate ownership in IBG LLC		28				28	(28)
Comprehensive Income				41	(13)	28	152	180
Balance at Jun. 30, 2018	$ 1	865	(3)	323	(3)	1,183	5,517	6,700
Balance (in shares) at Jun. 30, 2018	73,674,391
Issuance of common stock in follow-on offering		25				25	(25)
Issuance of common stock in follow-on offering (in shares)	1,537,727
Common Stock distributed pursuant to stock incentive plans (in shares)	14,770
Compensation for stock grants vesting in the future		2				2	11	13
Deferred tax benefit retained - follow-on offering		3				3		3
Dividends paid to stockholders				(8)		(8)		(8)
Distributions from IBG LLC to noncontrolling interests							(60)	(60)
Comprehensive Income				39	(1)	38	217	255
Balance at Sep. 30, 2018	$ 1	895	(3)	354	(4)	1,243	5,660	6,903
Balance (in shares) at Sep. 30, 2018	75,226,888
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
Issuance of common stock in follow-on offering (in shares)	21,075
Common Stock distributed pursuant to stock incentive plans (in shares)	441
Compensation for stock grants vesting in the future		3				3	10	13
Dividends paid to stockholders				(8)		(8)		(8)
Distributions from IBG LLC to noncontrolling interests							(205)	(205)
Comprehensive Income				36	(6)	30	203	233
Balance at Sep. 30, 2019	$ 1	$ 930	$ (3)	$ 484	$ (7)	$ 1,405	$ 6,248	$ 7,653
Balance (in shares) at Sep. 30, 2019	76,878,300

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