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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, 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 - IBKR Promotions   1 (3)     (2) 2  
Issuance of common stock - IBKR Promotions, Share 50,000              
Net distribution of common stocks - IBKR Promotion     3     3   3
Compensation for stock grants vesting in the future   5       5 16 21
Dividends paid to stockholders - $0.10 per share       (9)   (9)   (9)
Distributions from IBG LLC to noncontrolling interests             (80) (80)
Adjustments for changes in proportionate ownership in IBG LLC   1       1 (1)  
Comprehensive income       73 (10) 63 262 325
Balance at Mar. 31, 2022 $ 1 1,449 (5) 1,017 (6) 2,456 8,026 10,482
Balance (in shares) at Mar. 31, 2022 98,409,572              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,271,794              
Issuance of common stock - IBKR Promotions   1 (4)     (3) 3  
Issuance of common stock - IBKR Promotions, Share 50,000              
Net distribution of common stocks - IBKR Promotion     3     3   3
Compensation for stock grants vesting in the future   5       5 16 21
Repurchase of common stock for employee tax withholding under stock incentive plans     (20)     (20)   (20)
Sales of treasury stock     20 1   21 2 23
Dividends paid to stockholders - $0.10 per share       (11)   (11)   (11)
Distributions from IBG LLC to noncontrolling interests             (151) (151)
Adjustments for changes in proportionate ownership in IBG LLC   25       25 (25)  
Comprehensive income       72 (24) 48 207 255
Balance at Jun. 30, 2022 $ 1 1,480 (6) 1,079 (30) 2,524 8,078 10,602
Balance (in shares) at Jun. 30, 2022 99,731,366              
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) 296              
Net distribution of common stocks - IBKR Promotion     2     2 (1) 1
Compensation for stock grants vesting in the future   5       5 17 22
Deferred tax benefit retained - follow-on offering   3       3   3
Dividends paid to stockholders - $0.10 per share       (10)   (10)   (10)
Distributions from IBG LLC to noncontrolling interests             (78) (78)
Comprehensive income       99 (30) 69 291 360
Balance at Sep. 30, 2022 $ 1 1,572 (4) 1,168 (60) 2,677 8,223 10,900
Balance (in shares) at Sep. 30, 2022 103,003,052              
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 - $0.10 per share       (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, Share 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 - $0.10 per share       (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 - $0.10 per share       (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