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Commitments and Contingencies - PVNGS Liability and Insurance Matters, Navajo Nation Allottee Matters and Texas Winter Storm (Details)
 1 Months Ended 3 Months Ended
Jul. 29, 2022
USD ($)
Sep. 30, 2012
landOwner
Mar. 31, 2023
USD ($)
generatingUnit
lawsuit
Dec. 31, 2022
USD ($)
Jan. 31, 2023
USD ($)
Dec. 01, 2015
allotment_parcel
Jul. 13, 2015
a
Jan. 22, 2015
allotment_parcel
Apr. 30, 2014
allotment_parcel
PNM                  
Public Utilities, Commitments And Contingencies [Line Items]                  
Payments for legal settlements $ 19,800,000                
PNM | Navajo Nation Allottee Matters                  
Public Utilities, Commitments And Contingencies [Line Items]                  
Number of landowners involved in the appeal | landOwner   43              
Number of allotments where landowners are revoking rights of way renewal consents (in allotment parcels) | allotment_parcel           2   10 6
Area of land (in acres) | a             15.49    
Number of allotment parcels at issue that are not to be condemned | allotment_parcel           2      
Number of allotment parcels at issue | allotment_parcel           5      
Payments for legal settlements       $ 1,500,000          
PNM | Palo Verde Nuclear Generating Station | Nuclear plant                  
Public Utilities, Commitments And Contingencies [Line Items]                  
Number of units | generatingUnit     3            
Maximum potential assessment per incident         $ 31,200,000        
Annual payment limitation related to incident         4,700,000        
Aggregate amount of all risk insurance     $ 2,800,000,000            
Maximum amount under nuclear electric insurance limited         $ 5,100,000        
PNM | Maximum | Palo Verde Nuclear Generating Station | Nuclear plant                  
Public Utilities, Commitments And Contingencies [Line Items]                  
Liability insurance coverage     13,700,000,000            
Liability insurance coverage sublimit     $ 2,250,000,000            
Texas-New Mexico Power Company                  
Public Utilities, Commitments And Contingencies [Line Items]                  
New claims filed | lawsuit     22            
Regulatory asset, allowance for credit loss     $ 800,000 $ 800,000          
Commercial providers | PNM | Palo Verde Nuclear Generating Station | Nuclear plant                  
Public Utilities, Commitments And Contingencies [Line Items]                  
Liability insurance coverage     450,000,000            
Industry Wide Retrospective Assessment Program | PNM | Palo Verde Nuclear Generating Station | Nuclear plant                  
Public Utilities, Commitments And Contingencies [Line Items]                  
Liability insurance coverage     $ 13,200,000,000