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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)	1 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2021	Jul. 30, 2021	Sep. 30, 2020	Jul. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Payment defaults under agreements	$ 0				$ 0		$ 0
Dividends declared per common share (dollars per share)	$ 0.3275	$ 0.3275	$ 0.3075	$ 0.3075	$ 0.3275	$ 0.3075	$ 0.9825	$ 0.9225
Dividends declared on common stock					$ 56,222,000	$ 48,987,000	$ 84,333,000	$ 73,480,000
PNMR
Business Acquisition [Line Items]
Equity contribution from parent					0
PNM
Business Acquisition [Line Items]
Dividends declared on common stock					$ 60,000,000	0	60,000,000	40,654,000
Texas-New Mexico Power Company
Business Acquisition [Line Items]
Equity contribution from parent							$ 52,000,000	0
Dividends declared on common stock						$ 16,174,000		$ 34,613,000

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