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Regulatory Requirements (Tables)
 12 Months Ended
Dec. 31, 2021
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital Net Capital/ Eligible Equity Requirement Excess (in millions)IB LLC $ 5,581 $ 1,001 $ 4,580IBKRFS 598 12 586IBHK 860 278 582Other regulated operating subsidiaries 1,553 276 1,277 $ 8,592 $ 1,567 $ 7,025