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Regulatory Requirements (Tables)
 3 Months Ended
Mar. 31, 2021
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,211

$

753

$

4,458

IBKRFS

600

21

579

IBHK

738

264

474

Other regulated operating subsidiaries

1,644

420

1,224

$

8,193

$

1,458

$

6,735