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Regulatory Requirements (Tables)
 12 Months Ended
Dec. 31, 2023
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

7,319

$

823

$

6,496

IBHK

1,265

223

1,042

IBIE

685

189

496

Other regulated operating subsidiaries

2,333

142

2,191

$

11,602

$

1,377

$

10,225