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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, 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              
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              
Common Stock distributed pursuant to stock incentive plans (in shares) 2,265,002              
Compensation for stock grants vesting in the future   4       4 21 25
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       (14)   (14)   (14)
Distributions from IBG LLC to noncontrolling interests             (82) (82)
Adjustments for changes in proportionate ownership in IBG LLC   28       28 (28)  
Comprehensive Income       47 10 57 385 442
Balance at Jun. 30, 2017 $ 1 $ 807 $ (3) $ 236 $ 8 $ 1,049 $ 5,142 $ 6,191
Common stock, shares issued at Jun. 30, 2017 70,384,414