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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($)		1 Months Ended		3 Months Ended
	Apr. 30, 2024	Feb. 29, 2024	Feb. 28, 2023	Mar. 31, 2024	Mar. 31, 2023
Subsequent Event [Line Items]
Payment defaults under agreements				$ 0
Dividends declared per common share (dollars per share)		$ 0.3875	$ 0.3675	$ 0.3875	$ 0.3675
Dividends declared on common stock				$ 34,952,000	$ 31,545,000
PNMR | Subsequent event
Subsequent Event [Line Items]
Equity contribution from parent	$ 55,000,000
Texas-New Mexico Power Company
Subsequent Event [Line Items]
Dividends declared on common stock				$ 0	$ 0

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