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Regulatory Requirements (Tables)
 9 Months Ended
Sep. 30, 2019
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,386

$

422

$

4,964

TH LLC

44

—

44

IBKRFS

572

94

478

Other regulated Operating Companies

828

137

691

$

6,830

$

653

$

6,177