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Regulatory Requirements (Tables)
 3 Months Ended
Mar. 31, 2020
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,137

$

343

$

4,794

IBKRFS

579

21

558

IBHK

438

109

329

Other regulated operating subsidiaries

789

42

747

$

6,943

$

515

$

6,428