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

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

4,621

$

520

$

4,101

IBKRFS

593

21

572

IBHK

632

225

407

Other regulated operating subsidiaries

896

56

840

$

6,742

$

822

$

5,920