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Financing - Financing Activities (Details) - USD ($)				3 Months Ended
	Mar. 09, 2021	Dec. 22, 2020	Apr. 14, 2020	Mar. 31, 2021	Aug. 31, 2020	Mar. 09, 2018
PNMR Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from short-term debt	$ 80,000,000.0
PNMR 2015 Term Loan Agreement
Debt Instrument [Line Items]
Term loans						$ 150,000,000.0
PNMR 2020 Delayed-Draw Term Loan
Debt Instrument [Line Items]
Aggregate principal amount		$ 300,000,000.0
Term loans				$ 300,000,000.0
Proceeds from issuance of debt		$ 80,000,000.0
Variable interest rate				1.36%
PNMR 2019 Term Loan
Debt Instrument [Line Items]
Variable interest rate				1.07%
PNMR 2020 Term Loan
Debt Instrument [Line Items]
Variable interest rate				1.21%
PNM | PNM 2019 40 Million Term Loan
Debt Instrument [Line Items]
Aggregate principal amount				$ 40,000,000.0
Variable interest rate				0.76%
PNM | Maximum
Debt Instrument [Line Items]
Maturity term over which financings require regulator approval (more than)				18 months
PNMR | PNMR 2020 Delayed-Draw Term Loan
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 220,000,000.0
PNMR | PNMR 2020 Term Loan
Debt Instrument [Line Items]
Term loans				$ 150,000,000.0
PNMR | PNMR Development Term Loan
Debt Instrument [Line Items]
Term loans				$ 65,000,000.0
Texas-New Mexico Power Company
Debt Instrument [Line Items]
Proceeds from short-term debt			$ 500,000
Line of credit | PNMR and PNMR Development
Debt Instrument [Line Items]
Ratio of debt to capital (less than or equal to)				70.00%
Line of credit | PNM and TNMP
Debt Instrument [Line Items]
Ratio of debt to capital (less than or equal to)				65.00%
Letter of credit | PNMR | WFB LOC Facility
Debt Instrument [Line Items]
Aggregate principal amount					$ 30,300,000
Unsecured Debt | PNMR 2018 SUNS 3.25 percent due March 2021
Debt Instrument [Line Items]
Aggregate principal amount						$ 300,000,000.0
Stated interest rate						3.25%
Unsecured Debt | PNM | PNM 2019 40 Million Term Loan
Debt Instrument [Line Items]
Term loans				$ 40,000,000.0
Mortgage Bonds | Texas-New Mexico Power Company | TNMP First Mortgage Bonds
Debt Instrument [Line Items]
Aggregate principal amount				$ 750,000,000.0
Debt instrument, prepayment period				30 days
Debt instrument, redemption price, percentage of principal amount redeemed				100.00%
Bonds | Pollution Control Revenue Bonds
Debt Instrument [Line Items]
Variable interest rate				0.14%
Term loan agreement with banks | Texas-New Mexico Power Company | PNMR Development Term Loan
Debt Instrument [Line Items]
Variable interest rate				1.48%

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