v3.26.1
Business Developments And Risks And Uncertainties (Narrative) (Detail)
$ in Millions
1 Months Ended 6 Months Ended
Jul. 01, 2026
USD ($)
Jan. 01, 2026
USD ($)
Jul. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Segments
Business Acquisition [Line Items]        
Number of operating segments | Segments       3
Puerto Rico Electric Power Authority [Member]        
Business Acquisition [Line Items]        
Outstanding bonds       $ 554
Proposed settlement amount offered to non-settling bondholders       $ 3,000
Recovery percentage on non-settling bondholders claims       35.00%
National Public Finance Guarantee Corporation [Member] | Puerto Rico Electric Power Authority [Member]        
Business Acquisition [Line Items]        
Claims payments   $ 11    
Subsequent Event [Member] | Puerto Rico Electric Power Authority [Member]        
Business Acquisition [Line Items]        
Bankruptcy claims transferred to custodian     $ 30  
Subsequent Event [Member] | National Public Finance Guarantee Corporation [Member] | Puerto Rico Electric Power Authority [Member]        
Business Acquisition [Line Items]        
Claims payments $ 46