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Regulatory Requirements (Tables)
 9 Months Ended
Sep. 30, 2023
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

7,041

$

783

$

6,258

IBHK

1,171

229

942

IBIE

656

170

486

Other regulated operating subsidiaries

2,135

116

2,019

$

11,003

$

1,298

$

9,705