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Regulatory and Rate Matters - Integrated Resource Plans and Abandonment Applications (Details)			12 Months Ended
	Jan. 29, 2021	Jul. 03, 2017	Dec. 31, 2020
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
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 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Planning period covered, IRP	20 years

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