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Regulatory Requirements (Tables)
 3 Months Ended
Mar. 31, 2025
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

9,666

$

1,212

$

8,454

IBHK

1,517

368

1,149

IBIE

1,360

351

1,009

Other regulated operating subsidiaries

2,453

154

2,299

$

14,996

$

2,085

$

12,911