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Regulatory Requirements (Tables)
 3 Months Ended
Mar. 31, 2022
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,663

$

886

$

4,777

IBKRFS

580

12

568

IBHK

888

234

654

Other regulated operating subsidiaries

1,712

293

1,419

$

8,843

$

1,425

$

7,418