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Equity And Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended			3 Months Ended						7 Months Ended	9 Months Ended		36 Months Ended	48 Months Ended	144 Months Ended	197 Months Ended
	Oct. 17, 2023	Oct. 04, 2023	Jul. 27, 2023	Jul. 26, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2010	Sep. 30, 2023	Dec. 31, 2022	Sep. 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	10,000
Preferred stock shares issued					0			0						0	0			0	0	0
Preferred stock shares outstanding					0			0						0	0			0	0	0
Amortization period DTA (years)															15 years
Unamortized deferred tax asset arising from equity offerings					$ 207			$ 207						$ 207	$ 207			$ 207	$ 193	$ 207
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					$ 681			$ 681						681	$ 681			$ 681		681
Tax savings owed to IBG Holdings LLC																				579
Tax savings retained by IBG Inc.																				102
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			2,632,748															370,000	37,478,697
Shares issued, value			$ 229
Distribution from IBG LLC															603
Cash distribution to IBG, Inc.															150
Dividend per share					$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Dividends paid to common shareholders														$ 31	$ 31	$ 30
Declaration Date															Oct. 17, 2023
Payment Date															Dec. 14, 2023
Record Date															Dec. 01, 2023
Mr. Thomas Peterffy [Member]
Equity And Earnings Per Share [Line Items]
Majority stakeholder percentage			91.30%
Subsequent Event [Member]
Equity And Earnings Per Share [Line Items]
Shares Issued		50,000
Dividend per share	$ 0.10
IBG LLC [Member]
Equity And Earnings Per Share [Line Items]
IBG Inc. ownership % of IBG LLC					25.40%			25.40%						25.40%	25.40%			25.40%		25.40%		10.00%
IBG Holdings ownership % of IBG LLC			25.40%		24.80%			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%
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	$ 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			1,000,000,000	1,000,000,000	1,000,000,000
Common stock, shares issued					107,125,489			107,125,489						107,125,489	107,125,489			107,125,489	103,057,148	107,125,489
Common stock, shares outstanding					106,992,860			106,992,860						106,992,860	106,992,860			106,992,860	102,887,728	106,992,860
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	$ 0.01
Shares authorized					100	100		100	100					100	100			100	100	100
Common stock, shares issued					100	100		100	100					100	100			100	100	100
Common stock, shares outstanding					100	100		100	100					100	100			100	100	100

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