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Commitments and Contingencies - PVNGS Liability and Insurance Matters, Navajo Nation Allottee Matters and Texas Winter Storm (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
generatingUnit
lawsuit
Dec. 31, 2012
landOwner
Dec. 01, 2015
allotment_parcel
Jul. 13, 2015
a
Jan. 22, 2015
allotment_parcel
Dec. 31, 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