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Regulatory and Rate Matters - Integrated Resource Plan (Details)
 12 Months Ended
May 04, 2016
Jul. 01, 2014
Dec. 31, 2018
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
Planning period covered, IRP     20 years
Period of action plan     4 years
Public Service Company of New Mexico | NMPRC      
Public Utilities, General Disclosures [Line Items]      
Period of action plan   4 years  
Period of time to show good cause why a docket should remain open 30 days