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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, 2020 $ 1 $ 1,244 $ (3) $ 683 $ 26 $ 1,951 $ 7,052 $ 9,003
Balance (in shares) at Dec. 31, 2020 90,909,889              
Issuance of common stock in follow-on offering   145       145 (145)  
Issuance of common stock in follow-on offering, shares 6,079,542              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,220,141              
Issuance of common stock - IBKR Promotions   3 (11)     (8) 8  
Issuance of common stock - IBKR Promotions, shares 150,000              
Net distribution of common stocks - IBKR Promotion     9     9   9
Compensation for stock grants vesting in the future   18       18 62 80
Deferred tax benefit retained - follow-on offering   7       7   7
Repurchase of common stock for employee tax withholding under stock incentive plans     (27)     (27)   (27)
Sales of treasury stock     27     27   26
Sales of treasury stock             (1)  
Dividends paid to stockholders - $0.10 per share       (38)   (38)   (38)
Distributions from IBG LLC to noncontrolling interests             (377) (377)
Adjustments for changes in proportionate ownership in IBG LLC   25       25 (25)  
Comprehensive income       308 (22) 286 1,253 1,539
Balance at Dec. 31, 2021 $ 1 1,442 (5) 953 4 2,395 7,827 10,222
Balance (in shares) at Dec. 31, 2021 98,359,572              
Issuance of common stock in follow-on offering   84       84 (84)  
Issuance of common stock in follow-on offering, shares 3,271,390              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,276,186              
Issuance of common stock - IBKR Promotions   2 (10)     (8) 8  
Issuance of common stock - IBKR Promotions, shares 150,000              
Net distribution of common stocks - IBKR Promotion     9     9   9
Compensation for stock grants vesting in the future   23       23 69 92
Deferred tax benefit retained - follow-on offering   3       3   3
Repurchase of common stock for employee tax withholding under stock incentive plans     (20)     (20)   (20)
Sales of treasury stock     20 1   21   23
Sales of treasury stock             2  
Dividends paid to stockholders - $0.10 per share       (40)   (40)   (40)
Distributions from IBG LLC to noncontrolling interests             (405) (405)
Adjustments for changes in proportionate ownership in IBG LLC   27       27 (27)  
Comprehensive income       380 (26) 354 1,377 1,731
Balance at Dec. 31, 2022 $ 1 1,581 (6) 1,294 (22) 2,848 8,767 11,615
Balance (in shares) at Dec. 31, 2022 103,057,148              
Issuance of common stock in follow-on offering   81       81 (81)  
Issuance of common stock in follow-on offering, shares 2,632,748              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,389,032              
Issuance of common stock - IBKR Promotions   2 (8)     (6) 6  
Issuance of common stock - IBKR Promotions, shares 100,000              
Net distribution of common stocks - IBKR Promotion     11     11 1 12
Compensation for stock grants vesting in the future   25       25 75 100
Deferred tax benefit retained - follow-on offering   4       4   4
Repurchase of common stock for employee tax withholding under stock incentive plans     (34)     (34)   (34)
Sales of treasury stock     34     34   34
Dividends paid to stockholders - $0.10 per share       (42)   (42)   (42)
Distributions from IBG LLC to noncontrolling interests             (556) (556)
Adjustments for changes in proportionate ownership in IBG LLC   33       33 (33)  
Comprehensive income       600 30 630 2,304 2,934
Balance at Dec. 31, 2023 $ 1 $ 1,726 $ (3) $ 1,852 $ 8 $ 3,584 $ 10,483 $ 14,067
Balance (in shares) at Dec. 31, 2023 107,178,928