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

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,460

$

945

$

4,515

IBKRFS

607

11

596

IBHK

810

281

529

Other regulated operating subsidiaries

1,774

272

1,502

$

8,651

$

1,509

$

7,142