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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