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Regulatory Requirements (Tables)
 9 Months Ended
Sep. 30, 2025
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

10,443

$

1,628

$

8,815

IBHK

1,553

592

961

IBIE

1,696

382

1,314

Other regulated operating subsidiaries

2,780

179

2,601

$

16,472

$

2,781

$

13,691