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Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
401(k) plan
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
401(k) plan	$ 16,118	$ 15,844	$ 16,648
401(k) plan | PNM
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
401(k) plan	10,839	11,067	11,826
401(k) plan | TNMP
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
401(k) plan	5,279	4,776	4,823
Non-qualified plan
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Non-qualified plan	1,197	(1,027)	3,594
Non-qualified plan | PNM
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Non-qualified plan	825	(721)	2,622
Non-qualified plan | TNMP
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Non-qualified plan	$ 372	$ (305)	$ 972

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 710
-SubTopic 10
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483043/710-10-30-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-1

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X

- References

No definition available.

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

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