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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              
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