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Financing - Borrowing Arrangements Between PNMR and Its Subsidiaries and Short-term Debt (Details)	Nov. 01, 2020 USD ($)	Feb. 22, 2019 USD ($)	Feb. 20, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 26, 2018 USD ($)	Feb. 20, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 12, 2017 USD ($)	Dec. 21, 2016 USD ($)	Nov. 30, 2016 USD ($)	Jan. 08, 2014 USD ($) bank
Short-term Debt [Line Items]
Financing capacity					$ 24,500,000.0
Short-term debt				$ 235,900,000			$ 305,400,000
Letters of credit outstanding				4,700,000
JPMorgan Chase Bank, N.A.
Short-term Debt [Line Items]
Letters of credit outstanding				30,300,000
PNMR 2016 One Year Term Loan
Short-term Debt [Line Items]
Short-term debt				$ 150,000,000			100,000,000		$ 100,000,000.0
PNMR 2018 One Year Term Loan
Short-term Debt [Line Items]
Variable interest rate				3.20%
PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity				$ 300,000,000						$ 10,000,000.0
Short-term debt				20,000,000			165,600,000
PNMR Revolving Credit Facility | Scenario, forecast
Short-term Debt [Line Items]
Financing capacity	$ 290,000,000.0
PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Short-term debt				$ 6,000,000			0
Interest rates on outstanding borrowings				3.46%
Subsequent Event
Short-term Debt [Line Items]
Financing capacity		$ 25,000,000.0
Invested cash		900,000
Subsequent Event | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		250,000,000
Subsequent Event | Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		729,000,000
Subsequent Event | PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		14,100,000.0
PNM Resources
Short-term Debt [Line Items]
Short-term debt				$ 170,000,000			265,600,000
PNM Resources | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Interest rates on outstanding borrowings				3.76%
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Subsidiary loan agreements				$ 100,000			0
Short-term debt				17,500,000			0
Letters of credit outstanding				$ 100,000
Texas-New Mexico Power Company | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Interest rates on outstanding borrowings				3.17%
Texas-New Mexico Power Company | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity				$ 75,000,000
Short-term debt				17,500,000			0
Texas-New Mexico Power Company | TNMP Revolving Credit Facility | 9.50% due April 2019
Short-term Debt [Line Items]
Aggregate principal amount of bonds				75,000,000
Texas-New Mexico Power Company | Subsequent Event
Short-term Debt [Line Items]
Subsidiary loan agreements		0	$ 0
Invested cash		0	$ 0
Texas-New Mexico Power Company | Subsequent Event | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		37,400,000
Public Service Company of New Mexico
Short-term Debt [Line Items]
Subsidiary loan agreements				19,800,000.0		$ 0	0
Short-term debt				42,400,000			39,800,000
Letters of credit outstanding				2,500,000
Public Service Company of New Mexico | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Financing capacity								$ 40,000,000.0
Public Service Company of New Mexico | PNM 2014 New Mexico Credit Facility
Short-term Debt [Line Items]
Financing capacity											$ 50,000,000.0
Number of participating lenders (in banks) | bank											8
Public Service Company of New Mexico | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity				400,000,000						$ 40,000,000.0
Short-term debt				$ 32,400,000			39,800,000
Interest rates on outstanding borrowings				3.63%
Public Service Company of New Mexico | PNM Revolving Credit Facility | Scenario, forecast
Short-term Debt [Line Items]
Financing capacity	$ 360,000,000.0
Public Service Company of New Mexico | PNM 2014 New Mexico Credit Facility
Short-term Debt [Line Items]
Interest rates on outstanding borrowings				3.56%
Public Service Company of New Mexico | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Short-term debt				$ 10,000,000			$ 0
Public Service Company of New Mexico | Subsequent Event
Short-term Debt [Line Items]
Subsidiary loan agreements		0
Invested cash		18,100,000
Public Service Company of New Mexico | Subsequent Event | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		397,500,000
Public Service Company of New Mexico | Subsequent Event | PNM 2014 New Mexico Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		$ 30,000,000
Maximum
Short-term Debt [Line Items]
Subsidiary loan agreements				$ 100,000,000

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