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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, 2016 $ 1 $ 775 $ (3) $ 203 $ (2) $ 974 $ 4,846 $ 5,820
Balance (in shares) at Dec. 31, 2016 68,119,412              
Issuance of common stock in follow-on offering   18       18 (18)  
Issuance of common stock in follow-on offering (in shares) 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
Balance (in shares) at Dec. 31, 2017 71,609,049              
Issuance of common stock in follow-on offering   25       25 (25)  
Issuance of common stock in follow-on offering (in shares) 1,537,727              
Common Stock distributed pursuant to stock incentive plans (in shares) 2,083,624              
Compensation for stock grants vesting in the future   10       10 48 58
Deferred tax benefit retained - follow-on offering   3       3   3
Repurchase of common stock for employee tax withholding under stock incentive plans     (45)     (45)   (45)
Sales of treasury stock     45 (1)   44 (4) 40
Dividends paid to stockholders       (29)   (29)   (29)
Distributions from IBG LLC to noncontrolling interests             (350) (350)
Adjustments for changes in proportionate ownership in IBG LLC   28       28 (28)  
Comprehensive Income       169 (13) 156 890 1,046
Balance at Dec. 31, 2018 $ 1 898 (3) 390 (4) 1,282 5,874 7,156
Balance (in shares) at Dec. 31, 2018 75,230,400              
Issuance of common stock in follow-on offering   1       1 (1)  
Issuance of common stock in follow-on offering (in shares) 21,075              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,627,565              
Issuance of common stock - Promotions, Share 10,000              
Compensation for stock grants vesting in the future   11       11 49 60
Repurchase of common stock for employee tax withholding under stock incentive plans     (27)     (27)   (27)
Sales of treasury stock     27     27 (1) 26
Dividends paid to stockholders       (31)   (31)   (31)
Distributions from IBG LLC to noncontrolling interests             (357) (357)
Adjustments for changes in proportionate ownership in IBG LLC   24       24 (24)  
Comprehensive Income       161 $ 4 165 948 1,113
Balance at Dec. 31, 2019 $ 1 $ 934 $ (3) $ 520   $ 1,452 $ 6,488 $ 7,940
Balance (in shares) at Dec. 31, 2019 76,889,040