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Stockholders' Equity (Details) - USD ($)			12 Months Ended
	Dec. 15, 2020	Oct. 20, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Payment of dividends			$ 255,800,000
Dividends payable, maximum distribution (in dollars per share)		$ 0.3675
PNMR 2020 Forward Equity Sales Agreement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)	6,200,000
Sale of stock, price per share (in dollars per share)	$ 45.805
Sale of stock, consideration received on transaction	$ 283,100,000
Payments of stock issuance costs	$ 100,000
Line of Credit
Class of Stock [Line Items]
Debt-to-capital ratio (not more than)			70.00%
Public Service Company of New Mexico
Class of Stock [Line Items]
Equity contribution from parent			$ 0	$ 53,000,000	$ 230,000,000
Requirement to obtain approval to transfer more than a percentage of PNM's assets			5.00%
Preferred stock, dividend rate			4.58%
Preferred stock, redemption percent			102.00%
Preferred stock outstanding (in shares)			115,293	115,293
Preferred stock, cumulative shares authorized (in shares)			10,000,000	10,000,000
Public Service Company of New Mexico | Line of Credit
Class of Stock [Line Items]
Debt-to-capital ratio (not more than)			65.00%
Public Service Company of New Mexico | Affiliated Entity
Class of Stock [Line Items]
Cash dividends paid to parent company by consolidated subsidiaries			$ 153,500,000	$ 60,000,000	40,700,000
Texas-New Mexico Power Company
Class of Stock [Line Items]
Equity contribution from parent			$ 68,000,000	52,000,000	71,000,000
Preferred stock, cumulative shares authorized (in shares)			1,000,000
Texas-New Mexico Power Company | Line of Credit
Class of Stock [Line Items]
Debt-to-capital ratio (not more than)			65.00%
Texas-New Mexico Power Company | Affiliated Entity
Class of Stock [Line Items]
Cash dividends paid to parent company by consolidated subsidiaries			$ 0	$ 0	$ 58,500,000
PNMR and TNMP
Class of Stock [Line Items]
Preferred stock outstanding (in shares)			0

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