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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, 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, shares 21,075              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,627,565              
Issuance of common stock - IBKR 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              
Issuance of common stock in follow-on offering   264       264 (264)  
Issuance of common stock in follow-on offering, shares 12,710,608              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,300,241              
Issuance of common stock - IBKR Promotions     (1)     (1) 1  
Issuance of common stock - IBKR Promotions, Share 10,000              
Net distribution of common stocks - IBKR Promotion     1     1   1
Compensation for stock grants vesting in the future   12       12 53 65
Deferred tax benefit retained - follow-on offering   13       13   13
Repurchase of common stock for employee tax withholding under stock incentive plans     (17)     (17)   (17)
Sales of treasury stock     17     17 1 18
Dividends paid to stockholders       (32)   (32)   (32)
Distributions from IBG LLC to noncontrolling interests             (288) (288)
Adjustments for changes in proportionate ownership in IBG LLC   21       21 (21)  
Comprehensive income       195 26 221 1,082 1,303
Balance at Dec. 31, 2020 $ 1 1,244 (3) 683 26 1,951 7,052 9,003
Balance (in shares) at Dec. 31, 2020 90,909,889              
Issuance of common stock in follow-on offering   145       145 (145)  
Issuance of common stock in follow-on offering, shares 6,079,542              
Common Stock distributed pursuant to stock incentive plans (in shares) 1,220,141              
Issuance of common stock - IBKR Promotions   3 (11)     (8) 8  
Issuance of common stock - IBKR Promotions, Share 150,000              
Net distribution of common stocks - IBKR Promotion     9     9   9
Compensation for stock grants vesting in the future   18       18 62 80
Deferred tax benefit retained - follow-on offering   7       7   7
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       (38)   (38)   (38)
Distributions from IBG LLC to noncontrolling interests             (377) (377)
Adjustments for changes in proportionate ownership in IBG LLC   25       25 (25)  
Comprehensive income       308 (22) 286 1,253 1,539
Balance at Dec. 31, 2021 $ 1 $ 1,442 $ (5) $ 953 $ 4 $ 2,395 $ 7,827 $ 10,222
Balance (in shares) at Dec. 31, 2021 98,359,572