v3.26.3
Business Developments And Risks And Uncertainties (Narrative) (Detail)
$ in Millions
1 Months Ended 9 Months Ended
Jul. 01, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jan. 01, 2026
USD ($)
Jul. 31, 2026
USD ($)
Sep. 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         $ 508
Proposed settlement amount offered to non-settling bondholders   $ 3,000      
Recovery percentage on non-settling bondholders claims   35.00%      
Bankruptcy claims transferred to custodian       $ 30  
National Public Finance Guarantee Corporation [Member] | Puerto Rico Electric Power Authority [Member]          
Business Acquisition [Line Items]          
Claims payments $ 46   $ 11