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Commitments and Contingencies - Coal Supply (Details)
 1 Months Ended 12 Months Ended
Feb. 17, 2022
$ / T
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2016
USD ($)
Other Commitments [Line Items]            
Other current assets   $ 22,485,000 $ 1,635,000 $ 22,485,000    
Four Corners | Coal Supply            
Other Commitments [Line Items]            
Payments for relief from obligations     75,000,000      
Public Service Company of New Mexico            
Other Commitments [Line Items]            
Other current assets   16,924,000 1,456,000 16,924,000    
Public Service Company of New Mexico | Loss on long-term purchase commitment | San Juan Generating Station            
Other Commitments [Line Items]            
Annual funding post-term reclamation trust     5,200,000 3,200,000 $ 5,500,000  
Public Service Company of New Mexico | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense         800,000  
Public Service Company of New Mexico | Mine Reclamation Trust | San Juan Generating Station            
Other Commitments [Line Items]            
Reclamation trust funding, next fiscal year     5,600,000      
Reclamation trust funding, year 2     0      
Reclamation trust funding, year 3     0      
Public Service Company of New Mexico | Mine Reclamation Trust | Four Corners            
Other Commitments [Line Items]            
Funds contributed to mine reclamation trust     2,200,000 2,000,000 $ 2,300,000  
Funds contributed next fiscal year through year five     2,100,000      
Public Service Company of New Mexico | Mine Reclamation Trust | San Juan Generating Station And Four Corners            
Other Commitments [Line Items]            
Customer reclamation funding cost, maximum     100,000,000      
Public Service Company of New Mexico | Surface | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Liability for interim storage costs   71,700,000 67,400,000 71,700,000    
Public Service Company of New Mexico | Surface | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense   3,600,000        
Public Service Company of New Mexico | Underground | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Liability for interim storage costs   26,100,000 27,900,000 26,100,000    
Public Service Company of New Mexico | Underground | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense   100,000   9,300,000    
Public Service Company of New Mexico | San Juan Generating Station | Surface | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Estimate of possible loss     74,100,000      
Public Service Company of New Mexico | San Juan Generating Station | Underground | Loss on long-term purchase commitment            
Other Commitments [Line Items]            
Estimate of possible loss     34,900,000      
Public Service Company of New Mexico | San Juan Generating Station | Coal Supply            
Other Commitments [Line Items]            
Other current assets   $ 26,300,000 20,400,000 26,300,000    
Public Service Company of New Mexico | San Juan Generating Station | Coal Supply | Subsequent Event            
Other Commitments [Line Items]            
Increase in price of coal (per ton) | $ / T 5.00          
Public Service Company of New Mexico | Four Corners | Increase in coal mine decommissioning liability            
Other Commitments [Line Items]            
Net expense       $ 2,500,000    
NM Capital | San Juan Generating Station | Coal Supply            
Other Commitments [Line Items]            
Coal mine reclamation bonds to be posted with NMMMD     118,700,000      
Issuance in letters of credit     $ 30,300,000     $ 30,300,000