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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 - $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              
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 - $0.10 per share       (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