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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, 2019 | $ 1 | $ 934 | $ (3) | $ 520 |  | $ 1,452 | $ 6,488 | $ 7,940
Balance (in shares) at Dec. 31, 2019 | 76,889,040 |  |  |  |  |  |  |
Issuance of common stock in follow-on offering |  | 264 |  |  |  | 264 | (264) |
Issuance of common stock in follow-on offering, shares | 12,710,608 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 1,300,241 |  |  |  |  |  |  |
Issuance of common stock - IBKR Promotions |  |  | (1) |  |  | (1) | 1 |
Issuance of common stock - IBKR Promotions, Share | 10,000 |  |  |  |  |  |  |
Net distribution of common stocks - IBKR Promotion |  |  | 1 |  |  | 1 |  | 1
Compensation for stock grants vesting in the future |  | 12 |  |  |  | 12 | 53 | 65
Deferred tax benefit retained - follow-on offering |  | 13 |  |  |  | 13 |  | 13
Repurchase of common stock for employee tax withholding under stock incentive plans |  |  | (17) |  |  | (17) |  | (17)
Sales of treasury stock |  |  | 17 |  |  | 17 | 1 | 18
Dividends paid to stockholders - $0.10 per share |  |  |  | (32) |  | (32) |  | (32)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (288) | (288)
Adjustments for changes in proportionate ownership in IBG LLC |  | 21 |  |  |  | 21 | (21) |
Comprehensive income |  |  |  | 195 | $ 26 | 221 | 1,082 | 1,303
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 in follow-on offering |  | 145 |  |  |  | 145 | (145) |
Issuance of common stock in follow-on offering, shares | 6,079,542 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 1,220,141 |  |  |  |  |  |  |
Issuance of common stock - IBKR Promotions |  | 3 | (11) |  |  | (8) | 8 |
Issuance of common stock - IBKR Promotions, Share | 150,000 |  |  |  |  |  |  |
Net distribution of common stocks - IBKR Promotion |  |  | 9 |  |  | 9 |  | 9
Compensation for stock grants vesting in the future |  | 18 |  |  |  | 18 | 62 | 80
Deferred tax benefit retained - follow-on offering |  | 7 |  |  |  | 7 |  | 7
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 |  |  |  | (38) |  | (38) |  | (38)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (377) | (377)
Adjustments for changes in proportionate ownership in IBG LLC |  | 25 |  |  |  | 25 | (25) |
Comprehensive income |  |  |  | 308 | (22) | 286 | 1,253 | 1,539
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 in follow-on offering |  | 84 |  |  |  | 84 | (84) |
Issuance of common stock in follow-on offering, shares | 3,271,390 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 1,276,186 |  |  |  |  |  |  |
Issuance of common stock - IBKR Promotions |  | 2 | (10) |  |  | (8) | 8 |
Issuance of common stock - IBKR Promotions, Share | 150,000 |  |  |  |  |  |  |
Net distribution of common stocks - IBKR Promotion |  |  | 9 |  |  | 9 |  | 9
Compensation for stock grants vesting in the future |  | 23 |  |  |  | 23 | 69 | 92
Deferred tax benefit retained - follow-on offering |  | 3 |  |  |  | 3 |  | 3
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 |  |  |  | (40) |  | (40) |  | (40)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (405) | (405)
Adjustments for changes in proportionate ownership in IBG LLC |  | 27 |  |  |  | 27 | (27) |
Comprehensive income |  |  |  | 380 | (26) | 354 | 1,377 | 1,731
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 |  |  |  |  |  |  |

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