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Regulatory Requirements (Tables)
 12 Months Ended
Dec. 31, 2019
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

5,381

$

549

$

4,832

IBKRFS

584

91

493

IBHK

360

145

215

Other regulated operating subsidiaries

867

44

823

$

7,192

$

829

$

6,363