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Pension and Other Postretirement Benefits - Schedule of Actuarial (Gain) Loss Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
PNM | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rates	$ (9,376)	$ 8,806
Demographic experience	3,313	(1,777)
Mortality rate	0	(2,739)
Other assumptions and experience	0	0
Actuarial (gain) loss	(6,063)	4,290
PNM | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rates	(877)	868
Demographic experience	(1,425)	(2,171)
Assumed participation rate	97	0
Mortality rate	0	(305)
Dental trend assumption	0	0
Actuarial (gain) loss	(2,205)	(1,608)
TNMP | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rates	(961)	969
Demographic experience	(1,125)	538
Mortality rate	0	(239)
Other assumptions and experience	39	(7)
Actuarial (gain) loss	(2,047)	1,261
TNMP | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rates	(179)	174
Demographic experience	32	(423)
Assumed participation rate	0	0
Mortality rate	0	(33)
Dental trend assumption	0	0
Actuarial (gain) loss	$ (147)	$ (282)

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- Definition

Defined Benefit Plan, Actuarial Gain (Loss) Resulting From Changes In Demographics And Other Trends

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- Definition

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- Definition

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- Definition

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- Definition

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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