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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, 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 - $0.10 per share       (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 - $0.10 per share       (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              
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              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,271,794              
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     3     3   3
Compensation for stock grants vesting in the future   5       5 16 21
Repurchase of common stock for employee tax withholding under stock incentive plans     (20)     (20)   (20)
Sales of treasury stock     20 1   21 2 23
Dividends paid to stockholders - $0.10 per share       (11)   (11)   (11)
Distributions from IBG LLC to noncontrolling interests             (151) (151)
Adjustments for changes in proportionate ownership in IBG LLC   25       25 (25)  
Comprehensive income       72 (24) 48 207 255
Balance at Jun. 30, 2022 $ 1 $ 1,480 $ (6) $ 1,079 $ (30) $ 2,524 $ 8,078 $ 10,602
Balance (in shares) at Jun. 30, 2022 99,731,366