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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              
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              
Compensation for stock grants vesting in the future   4       4 13 17
Net distribution of common stocks - IBKR Promotion     2     2   2
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