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Regulatory Requirements (Tables)
 12 Months Ended
Dec. 31, 2024
Regulatory Requirements [Abstract]  
Summary Of Capital, Capital Requirements And Excess Capital

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

9,450

$

1,268

$

8,182

IBHK

1,427

359

1,068

IBIE

1,302

293

1,009

Other regulated operating subsidiaries

2,274

170

2,104

$

14,453

$

2,090

$

12,363