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Summary of the Business and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) utility	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies Disclosures [Line Items]
Payment defaults	$ 0
Allowance for equity funds used during construction	$ 13,799,000	$ 13,217,000	$ 11,254,000
PNMR
Accounting Policies Disclosures [Line Items]
Number of regulated utilities | utility	2
Restricted cash	$ 0	0
Public Service Company of New Mexico
Accounting Policies Disclosures [Line Items]
Restricted cash	0	0
Allowance for funds used during construction, capitalized interest	$ 3,700,000	$ 3,400,000	$ 3,000,000
Allowance for funds used during construction, capitalized interest rate	1.70%	1.70%	2.40%
Allowance for equity funds used during construction	$ 9,323,000	$ 9,905,000	$ 6,958,000
Allowance for funds used during construction, capitalized cost of equity rate	4.26%	4.94%	3.42%
Impairment losses on securities held in the NDT	$ 25,800,000	$ (700,000)	$ 3,200,000
Texas-New Mexico Power Company
Accounting Policies Disclosures [Line Items]
Restricted cash	0	0
Allowance for funds used during construction, capitalized interest	$ 3,400,000	$ 1,600,000	$ 2,100,000
Allowance for funds used during construction, capitalized interest rate	2.25%	1.80%	2.20%
Allowance for equity funds used during construction	$ 4,500,000	$ 3,300,000	$ 4,300,000
Allowance for funds used during construction, capitalized cost of equity rate	2.99%	3.67%	4.42%

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

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