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Regulatory Requirements (Tables)
 6 Months Ended
Jun. 30, 2020
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,063

$

452

$

4,611

IBKRFS

579

21

558

IBHK

371

187

184

Other regulated operating subsidiaries

810

48

762

$

6,823

$

708

$

6,115