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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, 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              
Balance at Dec. 31, 2024 $ 1 1,816 (7) 2,515 (45) 4,280 12,317 16,597
Balance (in shares) at Dec. 31, 2024 109,061,059              
Issuance of common stock - IBKR Promotions   3 (10)     (7) 7  
Issuance of common stock - IBKR Promotions, shares 50,000              
Net distribution of common stocks - IBKR Promotion     6     6 1 7
Compensation for stock grants vesting in the future   8       8 23 31
Dividends paid to stockholders       (27)   (27)   (27)
Distributions from IBG LLC to noncontrolling interests             (196) (196)
Adjustments for changes in proportionate ownership in IBG LLC   1       1 (1)  
Comprehensive income       213 28 241 830 1,071
Balance at Mar. 31, 2025 $ 1 $ 1,828 $ (11) $ 2,701 $ (17) $ 4,502 $ 12,981 $ 17,483
Balance (in shares) at Mar. 31, 2025 109,111,059