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Financing - Short-term Debt and Liquidity (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) extension_option	Feb. 18, 2022 USD ($)	Dec. 31, 2020 USD ($)
Short-term Debt [Line Items]
Financing capacity	$ 40,000,000
Short-term debt	62,700,000		$ 32,000,000
Letters of credit outstanding	3,400,000
JPMorgan Chase Bank, N.A.
Short-term Debt [Line Items]
Letters of credit outstanding	30,300,000
PNM Resources
Short-term Debt [Line Items]
Short-term debt	54,900,000		12,000,000
PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity	300,000,000
Short-term debt	$ 54,900,000		12,000,000
PNMR Revolving Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings	1.61%
PNM Revolving Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings	1.35%
TNMP Revolving Credit Facility | PNM Resources
Short-term Debt [Line Items]
Interest rates on outstanding borrowings	0.85%
PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Short-term debt	$ 0		10,000,000
PNM
Short-term Debt [Line Items]
Short-term debt	7,400,000		10,000,000
Letters of credit outstanding	0
PNM | Lines of credit
Short-term Debt [Line Items]
NMPRC approved credit facility	40,000,000
PNM | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity	400,000,000
Short-term debt	7,400,000		0
PNM | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Short-term debt	0		10,000,000
TNMP
Short-term Debt [Line Items]
Short-term debt	400,000		0
Letters of credit outstanding	0
TNMP | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity	75,000,000
Short-term debt	400,000		$ 0
TNMP | TNMP Revolving Credit Facility | First Mortgage Bonds at 9.50% due 2019
Short-term Debt [Line Items]
Aggregate principal amount of bonds	75,000,000
PNM and TNMP | PNMR Development Revolving Credit Facility
Short-term Debt [Line Items]
Letters of credit outstanding	$ 0
Revolving Credit Facility | TNMP | First Mortgage Bonds at 9.50% due 2019
Short-term Debt [Line Items]
Number of extension options | extension_option	2
Extension option period	1 year
Subsequent Event | PNM Resources
Short-term Debt [Line Items]
Consolidated invested cash		$ 900,000
Subsequent Event | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		296,600,000
Subsequent Event | Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		799,800,000
Subsequent Event | PNM
Short-term Debt [Line Items]
Consolidated invested cash		1,000,000
Subsequent Event | PNM | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		400,000,000
Subsequent Event | PNM | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		40,000,000
Subsequent Event | TNMP
Short-term Debt [Line Items]
Consolidated invested cash		0
Subsequent Event | TNMP | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Available borrowing capacity		$ 63,200,000

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