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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, 2013 $ 1 $ 583 $ (3) $ 99 $ 27 $ 707 $ 4,385 $ 5,092
Common stock, shares issued at Dec. 31, 2013 54,788,049              
Issuance of common stock in follow-on offering   35       35 (35)  
Number of new stock issued during the period (in shares) 1,358,478              
Common Stock distributed pursuant to stock incentive plans (in shares) 2,445,200              
Compensation for stock grants vesting in the future   6       6 35 41
Stock Incentive Plan Adjustment             1 1
Stock incentive plan adjustment (in shares) 20,518              
Deferred tax benefit retained - follow-on offering   1       1   1
Dividends paid to stockholders       (23)   (23)   (23)
Distributions from IBG LLC to noncontrolling interests             (279) (279)
Adjustments for changes in proportionate ownership in IBG LLC   10       10 (10)  
Comprehensive Income       45 (15) 30 322 352
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             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