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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 |  |  |  |  |  |  |

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