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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, 2018 | $ 1 | $ 898 | $ (3) | $ 390 | $ (4) | $ 1,282 | $ 5,874 | $ 7,156
Balance (in shares) at Dec. 31, 2018 | 75,230,400 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 905 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 3 |  |  |  | 3 | 13 | 16
Dividends paid to stockholders |  |  |  | (8) |  | (8) |  | (8)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (60) | (60)
Comprehensive Income |  |  |  | 49 | (1) | 48 | 274 | 322
Balance at Mar. 31, 2019 | $ 1 | 901 | (3) | 431 | (5) | 1,325 | 6,101 | 7,426
Balance (in shares) at Mar. 31, 2019 | 75,231,305 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 311 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 3 |  |  |  | 3 | 13 | 16
Dividends paid to stockholders |  |  |  | (8) |  | (8) |  | (8)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (53) | (53)
Comprehensive Income |  |  |  | 46 | (7) | 39 | 213 | 252
Balance at Mar. 31, 2020 | $ 1 | $ 937 | $ (3) | $ 558 | $ (7) | $ 1,486 | $ 6,661 | $ 8,147
Balance (in shares) at Mar. 31, 2020 | 76,889,351 |  |  |  |  |  |  |

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