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

Net Capital/

Eligible Equity

Requirement

Excess

(in millions)

IB LLC

$

7,764

$

975

$

6,789

IBHK

1,261

279

982

IBIE

671

193

478

Other regulated operating subsidiaries

2,303

145

2,158

$

11,999

$

1,592

$

10,407