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Financing - Financing Activities (Details)				3 Months Ended	12 Months Ended
	Jan. 24, 2022 USD ($)	Mar. 09, 2021 USD ($)	Dec. 22, 2020 USD ($)	Mar. 31, 2022	Dec. 31, 2021 USD ($)	Apr. 27, 2022 USD ($) bond_series	Apr. 21, 2022 USD ($)	Jan. 31, 2022 USD ($)	May 18, 2021 USD ($)	Mar. 09, 2018 USD ($)
Debt Instrument [Line Items]
Financing capacity								$ 40,000,000
Subsequent event
Debt Instrument [Line Items]
Remaining borrowing capacity							$ 705,500,000
PNMR 2020 Delayed-Draw Term Loan
Debt Instrument [Line Items]
Aggregate principal amount			$ 300,000,000
Proceeds from issuance of debt			$ 80,000,000
Remaining borrowing capacity		$ 220,000,000
PNM | Subsequent event
Debt Instrument [Line Items]
Remaining borrowing capacity							400,000,000
PNM | Maximum
Debt Instrument [Line Items]
Maturity term over which financings require regulator approval (more than)				18 months
Texas-New Mexico Power Company | Subsequent event
Debt Instrument [Line Items]
Remaining borrowing capacity							$ 0
Line of credit
Debt Instrument [Line Items]
Ratio of debt to capital (less than or equal to)				70.00%
Line of credit | PNMR 2021 Delayed-Draw Term Loan | Revolving credit facility
Debt Instrument [Line Items]
Financing capacity									$ 1,000,000,000
Proceeds from long-term lines of credit	$ 100,000,000				$ 900,000,000
Line of credit | PNM and TNMP
Debt Instrument [Line Items]
Ratio of debt to capital (less than or equal to)				65.00%
Unsecured Debt | PNMR 2018 SUNS 3.25% due March 2021
Debt Instrument [Line Items]
Aggregate principal amount										$ 300,000,000
Stated interest rate										3.25%
Repayments of debt		$ 80,000,000
Bonds | TNMP 2022 Bond Purchase Agreement at 4.13% Due May 12, 2022 | Subsequent event
Debt Instrument [Line Items]
Stated interest rate						4.13%
Bonds | TNMP 2022 Bond Purchase Agreement at 3.81% Due July 28, 2032 | Subsequent event
Debt Instrument [Line Items]
Stated interest rate						3.81%
Bonds | PNMR 2021 Delayed-Draw Term Loan
Debt Instrument [Line Items]
Variable interest rate				1.29%
Bonds | PNM | PNM 2021 75 Million Term Loan
Debt Instrument [Line Items]
Variable interest rate				1.28%
Bonds | Texas-New Mexico Power Company | TNMP 2022 Bond Purchase Agreement | Subsequent event
Debt Instrument [Line Items]
Aggregate principal amount						$ 160,000,000
Debt instrument, series of bond issuance | bond_series						2
Bonds | Texas-New Mexico Power Company | TNMP 2022 Bond Purchase Agreement at 4.13% Due May 12, 2022 | Subsequent event
Debt Instrument [Line Items]
Aggregate principal amount						$ 65,000,000
Bonds | Texas-New Mexico Power Company | TNMP 2022 Bond Purchase Agreement at 3.81% Due July 28, 2032 | Subsequent event
Debt Instrument [Line Items]
Aggregate principal amount						$ 95,000,000

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