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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, 2019 $ 1 $ 934 $ (3) $ 520   $ 1,452 $ 6,488 $ 7,940
Balance (in shares) at Dec. 31, 2019 76,889,040              
Common Stock distributed pursuant to stock incentive plans (in shares) 311              
Compensation for stock grants vesting in the future   3       3 13 16
Dividends paid to stockholders       (8)   (8)   (8)
Distributions from IBG LLC to noncontrolling interests             (53) (53)
Comprehensive income       46 $ (7) 39 213 252
Balance at Mar. 31, 2020 $ 1 937 (3) 558 (7) 1,486 6,661 8,147
Balance (in shares) at Mar. 31, 2020 76,889,351              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,297,716              
Compensation for stock grants vesting in the future   2       2 11 13
Repurchase of common stock for employee tax withholding under stock incentive plans     (17)     (17)   (17)
Sales of treasury stock     17     17 1 18
Dividends paid to stockholders       (7)   (7)   (7)
Distributions from IBG LLC to noncontrolling interests             (129) (129)
Adjustments for changes in proportionate ownership in IBG LLC   21       21 (21)  
Comprehensive income       32 4 36 193 229
Balance at Jun. 30, 2020 $ 1 960 (3) 583 (3) 1,538 6,716 8,254
Balance (in shares) at Jun. 30, 2020 78,187,067              
Issuance of common stock in follow-on offering   20       20 (20)  
Issuance of common stock in follow-on offering, shares 1,000,000              
Compensation for stock grants vesting in the future   4       4 13 17
Deferred tax benefit retained - follow-on offering   1       1   1
Dividends paid to stockholders       (8)   (8)   (8)
Distributions from IBG LLC to noncontrolling interests             (65) (65)
Comprehensive income       46 8 54 293 347
Balance at Sep. 30, 2020 $ 1 985 (3) 621 5 1,609 6,937 8,546
Balance (in shares) at Sep. 30, 2020 79,187,067              
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 - IBKR Promotions     (3)     (3) 3  
Issuance of common stock - IBKR Promotions, Share 50,000              
Net distribution of common stocks - IBKR Promotion     2     2   2
Compensation for stock grants vesting in the future   4       4 13 17
Dividends paid to stockholders       (9)   (9)   (9)
Distributions from IBG LLC to noncontrolling interests             (86) (86)
Adjustments for changes in proportionate ownership in IBG LLC   1       1 (1)  
Comprehensive income       107 (17) 90 420 510
Balance at Mar. 31, 2021 $ 1 1,249 (4) 781 9 2,036 7,401 9,437
Balance (in shares) at Mar. 31, 2021 90,959,889              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,210,929              
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     2     2   2
Compensation for stock grants vesting in the future   4       4 13 17
Repurchase of common stock for employee tax withholding under stock incentive plans     (27)     (27)   (27)
Sales of treasury stock     27     27 (1) 26
Dividends paid to stockholders       (9)   (9)   (9)
Distributions from IBG LLC to noncontrolling interests             (45) (45)
Adjustments for changes in proportionate ownership in IBG LLC   23       23 (23)  
Comprehensive income       92 5 97 430 527
Balance at Jun. 30, 2021 $ 1 1,277 (6) 864 14 2,150 7,778 9,928
Balance (in shares) at Jun. 30, 2021 92,220,818              
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) 5,036              
Net distribution of common stocks - IBKR Promotion     2     2   2
Compensation for stock grants vesting in the future   4       4 13 17
Deferred tax benefit retained - follow-on offering   7       7   7
Dividends paid to stockholders       (10)   (10)   (10)
Distributions from IBG LLC to noncontrolling interests             (99) (99)
Comprehensive income       42 (9) 33 133 166
Balance at Sep. 30, 2021 $ 1 $ 1,433 $ (4) $ 896 $ 5 $ 2,331 $ 7,680 $ 10,011
Balance (in shares) at Sep. 30, 2021 98,305,396