Business Developments And Risks And Uncertainties (Narrative) (Detail) $ in Millions |
6 Months Ended | ||
---|---|---|---|
Jul. 01, 2025
USD ($)
|
Jan. 01, 2025
USD ($)
|
Jun. 30, 2025
USD ($)
Segments
|
|
Business Acquisition [Line Items] | |||
Number of operating segments | Segments | 3 | ||
MBIA Mexico [Member] | |||
Business Acquisition [Line Items] | |||
Capital returned by subsidiary | $ 12 | ||
Puerto Rico Electric Power Authority [Member] | |||
Business Acquisition [Line Items] | |||
Outstanding insured bonds | $ 657 | ||
National Public Finance Guarantee Corporation [Member] | Puerto Rico Electric Power Authority [Member] | |||
Business Acquisition [Line Items] | |||
Claims payments | $ 13 | ||
Subsequent Event [Member] | National Public Finance Guarantee Corporation [Member] | Puerto Rico Electric Power Authority [Member] | |||
Business Acquisition [Line Items] | |||
Claims payments | $ 92 |