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Equity And Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended		3 Months Ended				6 Months Ended		36 Months Ended	45 Months Ended	144 Months Ended	194 Months Ended
	Jul. 27, 2023	Jul. 26, 2023	Jul. 18, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2010	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2023	Oct. 07, 2019	May 03, 2007
Equity And Earnings Per Share [Line Items]
IBG Holdings Redemption of IBG LLC																	10.00%
IBG Holdings LLC Ownership Percentage of Class B Common Stock																	100.00%
Preferred stock shares authorized				10,000		10,000				10,000			10,000	10,000	10,000
Preferred stock shares issued				0		0				0			0	0	0
Preferred stock shares outstanding				0		0				0			0	0	0
Amortization period DTA (years)										15 years
Unamortized deferred tax asset arising from equity offerings				$ 184		$ 184				$ 184			$ 184	$ 193	$ 184
Percent of tax savings owed to IBG Holdings LLC										85.00%
Percentage of tax savings retained by IBG Inc.										15.00%
Deferred tax asset from common stock offerings				$ 654		$ 654				$ 654			$ 654		654
Tax savings owed to IBG Holdings LLC															556
Tax savings retained by IBG Inc.															98
Tax savings paid to IBG Holdings LLC															$ 268
Shares reserved for future issuance																1,000,000	360,000,000
Shares redeemed by IBG Holdings from IBG LLC												5,013,259
Cash Redemptions IBG Holdings												$ 114
Fair Value of Issued Shares in Exchange for Membership Interests														$ 1,700
Stock registered, number of common stock		630,000
Shares Issued													370,000	37,478,697
Distribution from IBG LLC										454
Cash distribution to IBG, Inc.										112
Dividend per share				$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Dividends paid to common shareholders				$ 11	$ 10					$ 21	$ 20
Declaration Date										Jul. 18, 2023
Payment Date										Sep. 14, 2023
Record Date										Sep. 01, 2023
Subsequent Event [Member]
Equity And Earnings Per Share [Line Items]
Shares Issued	2,632,748
Shares issued, value	$ 218
Dividend per share			$ 0.10
Subsequent Event [Member] | Mr. Thomas Peterffy [Member]
Equity And Earnings Per Share [Line Items]
Majority stakeholder percentage	91.30%
IBG LLC [Member]
Equity And Earnings Per Share [Line Items]
IBG Inc. ownership % of IBG LLC				24.80%		24.80%				24.80%			24.80%		24.80%		10.00%
IBG Holdings ownership % of IBG LLC				24.80%		24.80%				24.80%			24.80%		24.80%
IBG LLC [Member] | Holdings [Member]
Equity And Earnings Per Share [Line Items]
IBG Holdings ownership % of IBG LLC																	90.00%
IBG LLC [Member] | Subsequent Event [Member]
Equity And Earnings Per Share [Line Items]
IBG Holdings ownership % of IBG LLC	25.40%
Common Class A [Member]
Equity And Earnings Per Share [Line Items]
Common stock, par value				$ 0.01		$ 0.01				$ 0.01			$ 0.01	$ 0.01	$ 0.01
Shares authorized				1,000,000,000		1,000,000,000				1,000,000,000			1,000,000,000	1,000,000,000	1,000,000,000
Common stock, shares issued				104,492,741		104,492,741				104,492,741			104,492,741	103,057,148	104,492,741
Common stock, shares outstanding				104,328,801		104,328,801				104,328,801			104,328,801	102,887,728	104,328,801
Common Class B [Member]
Equity And Earnings Per Share [Line Items]
Common stock, par value				$ 0.01		$ 0.01				$ 0.01			$ 0.01	$ 0.01	$ 0.01
Shares authorized				100		100				100			100	100	100
Common stock, shares issued				100		100				100			100	100	100
Common stock, shares outstanding				100		100				100			100	100	100

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Total value of shares redeemed by IBG Holdings from IBG LLC funded by using cash on hand at IBG LLC.

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