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Condensed 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, 2022 $ 1 $ 1,581 $ (6) $ 1,294 $ (22) $ 2,848 $ 8,767 $ 11,615
Balance (in shares) at Dec. 31, 2022 103,057,148              
Common Stock distributed pursuant to stock incentive plans (in shares) 71,562              
Net distribution of common stocks - IBKR Promotion     2     2   2
Compensation for stock grants vesting in the future   6       6 20 26
Dividends paid to stockholders       (10)   (10)   (10)
Distributions from IBG LLC to noncontrolling interests             (119) (119)
Adjustments for changes in proportionate ownership in IBG LLC   2       2 (2)  
Comprehensive income       148 5 153 566 719
Balance at Mar. 31, 2023 $ 1 1,589 (4) 1,432 (17) 3,001 9,232 12,233
Balance (in shares) at Mar. 31, 2023 103,128,710              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,314,031              
Issuance of common stock - IBKR Promotions   1 (4)     (3) 3  
Issuance of common stock - IBKR Promotions, shares 50,000              
Net distribution of common stocks - IBKR Promotion     3     3   3
Compensation for stock grants vesting in the future   6       6 17 23
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       (11)   (11)   (11)
Distributions from IBG LLC to noncontrolling interests             (223) (223)
Adjustments for changes in proportionate ownership in IBG LLC   30       30 (30)  
Comprehensive income       125 7 132 500 632
Balance at Jun. 30, 2023 $ 1 1,626 (5) 1,546 (10) 3,158 9,499 12,657
Balance (in shares) at Jun. 30, 2023 104,492,741              
Issuance of common stock in follow-on offering   81       81 (81)  
Issuance of common stock in follow-on offering, shares 2,632,748              
Net distribution of common stocks - IBKR Promotion     2     2   2
Compensation for stock grants vesting in the future   7       7 19 26
Deferred tax benefit retained - follow-on offering   4       4   4
Dividends paid to stockholders       (10)   (10)   (10)
Distributions from IBG LLC to noncontrolling interests             (111) (111)
Comprehensive income       167 (19) 148 548 696
Balance at Sep. 30, 2023 $ 1 1,718 (3) 1,703 (29) 3,390 9,874 13,264
Balance (in shares) at Sep. 30, 2023 107,125,489              
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              
Issuance of common stock - IBKR Promotions   1 (4)     (3) 3  
Issuance of common stock - IBKR Promotions, shares 50,000              
Net distribution of common stocks - IBKR Promotion     4     4 1 5
Compensation for stock grants vesting in the future   8       8 20 28
Dividends paid to stockholders       (11)   (11)   (11)
Distributions from IBG LLC to noncontrolling interests             (123) (123)
Adjustments for changes in proportionate ownership in IBG LLC   1       1 (1)  
Comprehensive income       175 (26) 149 544 693
Balance at Mar. 31, 2024 $ 1 1,736 (3) 2,016 (18) 3,732 10,927 14,659
Balance (in shares) at Mar. 31, 2024 107,228,928              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,347,296              
Issuance of common stock - IBKR Promotions   2 (6)     (4) 4  
Issuance of common stock - IBKR Promotions, shares 50,000              
Net distribution of common stocks - IBKR Promotion     5     5   5
Compensation for stock grants vesting in the future   6       6 20 26
Repurchase of common stock for employee tax withholding under stock incentive plans     (54)     (54)   (54)
Sales of treasury stock   1 54     55 2 57
Dividends paid to stockholders       (27)   (27)   (27)
Distributions from IBG LLC to noncontrolling interests             (281) (281)
Adjustments for changes in proportionate ownership in IBG LLC   37       37 (37)  
Comprehensive income       179 (2) 177 622 799
Balance at Jun. 30, 2024 $ 1 1,782 (4) 2,168 (20) 3,927 11,257 15,184
Balance (in shares) at Jun. 30, 2024 108,626,224              
Issuance of common stock in follow-on offering   12       12 (12)  
Issuance of common stock in follow-on offering, shares 333,000              
Issuance of common stock - IBKR Promotions   1 (6)     (5) 5  
Issuance of common stock - IBKR Promotions, shares 50,000              
Net distribution of common stocks - IBKR Promotion     6     6   6
Compensation for stock grants vesting in the future   6       6 20 26
Deferred tax benefit retained - follow-on offering   1       1   1
Dividends paid to stockholders       (27)   (27)   (27)
Distributions from IBG LLC to noncontrolling interests             (172) (172)
Adjustments for changes in proportionate ownership in IBG LLC   2       2 (2)  
Comprehensive income       184 39 223 764 987
Balance at Sep. 30, 2024 $ 1 $ 1,804 $ (4) $ 2,325 $ 19 $ 4,145 $ 11,860 $ 16,005
Balance (in shares) at Sep. 30, 2024 109,009,224