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Regulatory Requirements (Tables)
 9 Months Ended
Sep. 30, 2024
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

8,699

$

1,129

$

7,570

IBHK

1,344

320

1,024

IBIE

1,363

293

1,070

Other regulated operating subsidiaries

2,183

149

2,034

$

13,589

$

1,891

$

11,698