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Commitments and Contingencies - PVNG Liability and Insurance Matters (Details) - PNM - Palo Verde Nuclear Generating Station
 12 Months Ended
Dec. 31, 2023
USD ($)
generatingUnit
Jan. 31, 2023
USD ($)
Public Utilities, General Disclosures [Line Items]    
Number of units (in generating units) | generatingUnit 3  
Nuclear Plant    
Public Utilities, General Disclosures [Line Items]    
Number of units (in generating units) | generatingUnit 3  
Maximum potential assessment per incident $ 37,700,000 $ 36,300,000
Annual payment limitation related to incident 5,600,000 5,400,000
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   $ 4,900,000
Nuclear Plant | Commercial Providers    
Public Utilities, General Disclosures [Line Items]    
Liability insurance coverage 500,000,000  
Nuclear Plant | Industry Wide Retrospective Assessment Program    
Public Utilities, General Disclosures [Line Items]    
Liability insurance coverage 15,800,000,000  
Nuclear Plant | Maximum    
Public Utilities, General Disclosures [Line Items]    
Liability insurance coverage $ 16,300,000,000