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Commitments and Contingencies - PVNGS Liability and Insurance Matters (Narrative) (Details) - PNM - Nuclear Plant - PVNGS (Nuclear)
Dec. 31, 2024
USD ($)
bond
Dec. 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
Public Utilities, General Disclosures [Line Items]      
Maximum potential assessment per incident   $ 165,900,000 $ 36,300,000
Annual payment limitation related to incident   $ 24,700,000 $ 5,400,000
Number of nuclear power plants owned | bond 3    
Aggregate amount of all risk insurance $ 2,800,000,000    
Sublimit amount for non-nuclear property damage losses 2,250,000,000    
Retrospective premium assessment 5,100,000    
Commercial Providers      
Public Utilities, General Disclosures [Line Items]      
Liability insurance coverage 500,000,000    
Industry Wide Retrospective Assessment Program      
Public Utilities, General Disclosures [Line Items]      
Liability insurance coverage 15,800,000,000    
Maximum      
Public Utilities, General Disclosures [Line Items]      
Liability insurance coverage $ 16,300,000,000