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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, 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 - IBKR Promotions     (3)     (3) 3  
Issuance of common stock - IBKR Promotions, Share 50,000              
Net distribution of common stocks - IBKR Promotion     2     2   2
Compensation for stock grants vesting in the future   4       4 13 17
Dividends paid to stockholders       (9)   (9)   (9)
Distributions from IBG LLC to noncontrolling interests             (86) (86)
Adjustments for changes in proportionate ownership in IBG LLC   1       1 (1)  
Comprehensive income       107 (17) 90 420 510
Balance at Mar. 31, 2021 $ 1 1,249 (4) 781 9 2,036 7,401 9,437
Balance (in shares) at Mar. 31, 2021 90,959,889              
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              
Issuance of common stock - IBKR Promotions   1 (3)     (2) 2  
Issuance of common stock - IBKR Promotions, Share 50,000              
Net distribution of common stocks - IBKR Promotion     3     3   3
Compensation for stock grants vesting in the future   5       5 16 21
Dividends paid to stockholders       (9)   (9)   (9)
Distributions from IBG LLC to noncontrolling interests             (80) (80)
Adjustments for changes in proportionate ownership in IBG LLC   1       1 (1)  
Comprehensive income       73 (10) 63 262 325
Balance at Mar. 31, 2022 $ 1 $ 1,449 $ (5) $ 1,017 $ (6) $ 2,456 $ 8,026 $ 10,482
Balance (in shares) at Mar. 31, 2022 98,409,572