v3.26.3
Commitments and Contingencies - Nuclear Spent Fuel and Waste Disposal (Details) - PNM - Nuclear spent fuel and waste disposal - Palo Verde Nuclear Generating Station - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Public Utilities, Commitments And Contingencies [Line Items]    
Estimate of possible loss $ 55.6  
Other Deferred Credits    
Public Utilities, Commitments And Contingencies [Line Items]    
Loss contingency accrual $ 16.9 $ 15.5