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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, 2014 | $ 1 | $ 635 | $ (3) | $ 121 | $ 12 | $ 766 | $ 4,419 | $ 5,185
Common stock, shares issued at Dec. 31, 2014 | 58,612,245 |  |  |  |  |  |  |
Issuance of common stock in follow-on offering |  | 39 |  |  |  | 39 | (39) |
Number of new stock issued during the period (in shares) | 3,021,778 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 2,487,127 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 9 |  |  |  | 9 | 41 | 50
Deferred tax benefit retained - follow-on offering |  | 5 |  |  |  | 5 |  | 5
Repurchase of common stock for employee tax withholding under stock incentive plans |  |  | (25) |  |  | (25) |  | (25)
Sales of treasury stock |  | 4 | 25 |  |  | 29 |  | 29
Dividends paid to stockholders |  |  |  | (25) |  | (25) |  | (25)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (227) | (227)
Adjustments for changes in proportionate ownership in IBG LLC |  | 26 |  |  |  | 26 | (26) |
Comprehensive Income |  |  |  | 49 | (10) | 39 | 313 | 352
Balance at Dec. 31, 2015 | $ 1 | 718 | (3) | 145 | 2 | 863 | 4,481 | 5,344
Common stock, shares issued at Dec. 31, 2015 | 64,121,150 |  |  |  |  |  |  |
Issuance of common stock in follow-on offering |  | 22 |  |  |  | 22 | (22) |
Number of new stock issued during the period (in shares) | 1,596,200 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 2,402,062 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 8 |  |  |  | 8 | 43 | 51
Deferred tax benefit retained - follow-on offering |  | 2 |  |  |  | 2 |  | 2
Repurchase of common stock for employee tax withholding under stock incentive plans |  |  | (26) |  |  | (26) |  | (26)
Sales of treasury stock |  |  | 26 |  |  | 26 | (1) | 25
Dividends paid to stockholders |  |  |  | (26) |  | (26) |  | (26)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (224) | (224)
Adjustments for changes in proportionate ownership in IBG LLC |  | 25 |  |  |  | 25 | (25) |
Comprehensive Income |  |  |  | 84 | (4) | 80 | 594 | 674
Balance at Dec. 31, 2016 | $ 1 | 775 | (3) | 203 | (2) | 974 | 4,846 | $ 5,820
Common stock, shares issued at Dec. 31, 2016 | 68,119,412 |  |  |  |  |  |  |
Issuance of common stock in follow-on offering |  | 18 |  |  |  | 18 | (18) |
Number of new stock issued during the period (in shares) | 1,214,860 |  |  |  |  |  |  | 1,214,860
Common Stock distributed pursuant to stock incentive plans (in shares) | 2,274,777 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 9 |  |  |  | 9 | 44 | $ 53
Deferred tax benefit retained - follow-on offering |  | 2 |  |  |  | 2 |  | 2
Repurchase of common stock for employee tax withholding under stock incentive plans |  |  | (21) |  |  | (21) |  | (21)
Sales of treasury stock |  |  | 21 |  |  | 21 |  | 21
Dividends paid to stockholders |  |  |  | (28) |  | (28) |  | (28)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (272) | (272)
Adjustments for changes in proportionate ownership in IBG LLC |  | 28 |  |  |  | 28 | (28) |
Comprehensive Income |  |  |  | 76 | 11 | 87 | 771 | 858
Balance at Dec. 31, 2017 | $ 1 | $ 832 | $ (3) | $ 251 | $ 9 | $ 1,090 | $ 5,343 | $ 6,433
Common stock, shares issued at Dec. 31, 2017 | 71,609,049 |  |  |  |  |  |  |

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