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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, 2014 | $ 1 | $ 635 | $ (3) | $ 121 | $ 12 | $ 766 | $ 4,419 | $ 5,185
Common stock, shares issued at Dec. 31, 2014 | 58,612,245 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 2,461,632 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 4 |  |  |  | 4 | 20 | 24
Excess Tax Benefit On Stock Incentive Plan |  | 1 |  |  |  | 1 |  | 1
Repurchase of common stock for employee tax withholding under stock incentive plans |  |  | (25) |  |  | (25) |  | (25)
Dividends paid to stockholders |  |  |  | (12) |  | (12) |  | (12)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (69) | (69)
Adjustments for changes in proportionate ownership in IBG LLC |  | 27 |  |  |  | 27 | (27) |
Comprehensive Income |  |  |  | 10 | 3 | 13 | 117 | 130
Balance at Jun. 30, 2015 | $ 1 | 667 | (28) | 119 | 15 | 774 | 4,460 | 5,234
Common stock, shares issued at Jun. 30, 2015 | 61,073,877 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Common Stock distributed pursuant to stock incentive plans (in shares) | 2,395,210 |  |  |  |  |  |  |
Compensation for stock grants vesting in the future |  | 3 |  |  |  | 3 | 19 | 22
Repurchase of common stock for employee tax withholding under stock incentive plans |  |  | (26) |  |  | (26) |  | (26)
Dividends paid to stockholders |  |  |  | (13) |  | (13) |  | (13)
Distributions from IBG LLC to noncontrolling interests |  |  |  |  |  |  | (165) | (165)
Adjustments for changes in proportionate ownership in IBG LLC |  | 25 |  |  |  | 25 | (25) |
Comprehensive Income |  |  |  | 60 | 3 | 63 | 467 | 530
Balance at Jun. 30, 2016 | $ 1 | $ 746 | $ (29) | $ 192 | $ 5 | $ 915 | $ 4,777 | $ 5,692
Common stock, shares issued at Jun. 30, 2016 | 66,516,360 |  |  |  |  |  |  |

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- Definition This element represents the total net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent as it is presented on the Statement of Changes in Equity. + References No definition available. + Details
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- Definition Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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