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

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,432

$

423

$

5,009

TH LLC

51

—

51

IBKRFS

586

91

495

Other regulated Operating Companies

859

129

730

$

6,928

$

643

$

6,285