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Fair Value of Derivative and Other Financial Instruments - Schedule of Commodity Contract Contingent Consideration (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Contractual Liability	$ 32,035,000	$ 15,288,000
Existing Cash Collateral	0	0
Net Exposure	$ 26,397,000	$ 13,087,000

X

- Definition

Contract With Customer, Cash Collateral

+ References

No definition available.

+ Details

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Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contract With Customer, Liability, Net Exposure

+ References

No definition available.

+ Details

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Namespace Prefix:	pnm_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

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- References

No definition available.

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