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Regulatory and Rate Matters - Integrated Resource Plan (Details)
 3 Months Ended 12 Months Ended
Jul. 03, 2017
May 04, 2016
Sep. 30, 2019
Dec. 31, 2019
NMPRC        
Public Utilities, General Disclosures [Line Items]        
Period of action plan       4 years
Public Service Company of New Mexico        
Public Utilities, General Disclosures [Line Items]        
Required filing of Integrated Resource Plan       3 years
Period of action plan       4 years
Public Service Company of New Mexico | NMPRC        
Public Utilities, General Disclosures [Line Items]        
Period of time to show good cause why a docket should remain open   30 days    
Integrated Resource Plan, 2011 | Public Service Company of New Mexico        
Public Utilities, General Disclosures [Line Items]        
Planning period covered, IRP       20 years
Integrated Resource Plan, 2017 | Public Service Company of New Mexico        
Public Utilities, General Disclosures [Line Items]        
Planning period covered, IRP 20 years      
Integrated Resource Plan, 2020 | Public Service Company of New Mexico        
Public Utilities, General Disclosures [Line Items]        
Planning period covered, IRP     20 years