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Regulatory Requirements (Tables)
 6 Months Ended
Jun. 30, 2021
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

4,831

$

912

$

3,919

IBKRFS

611

11

600

IBHK

788

330

458

Other regulated operating subsidiaries

1,721

513

1,208

$

7,951

$

1,766

$

6,185