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Commitments and Contingencies - PVNGS Liability and Insurance Matters, Navajo Nation Allottee Matters and Texas Winter Storm (Details)
 1 Months Ended 9 Months Ended
Sep. 30, 2012
landOwner
Sep. 30, 2022
USD ($)
generatingUnit
Dec. 31, 2021
USD ($)
Dec. 01, 2015
allotment_parcel
Jul. 13, 2015
a
Jan. 22, 2015
allotment_parcel
Apr. 30, 2014
allotment_parcel
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      
PNM | Palo Verde Nuclear Generating Station | Nuclear plant              
Public Utilities, Commitments And Contingencies [Line Items]              
Ownership percentage in nuclear reactor   10.20%          
Number of units | generatingUnit   3          
Maximum potential assessment per incident   $ 42,100,000          
Annual payment limitation related to incident   6,200,000          
Aggregate amount of all risk insurance   2,800,000,000          
Maximum amount under Nuclear Electric Insurance Limited   5,400,000          
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]              
Regulatory assets   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