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Income Taxes - Federal Income Tax Reform (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2024	Dec. 31, 2017
Income Taxes [Line Items]
Federal and state excess deferred income taxes		$ 23.4
PNM
Income Taxes [Line Items]
Federal and state excess deferred income taxes		20.8
TNMP
Income Taxes [Line Items]
Federal and state excess deferred income taxes		$ 2.6
NMPRC
Income Taxes [Line Items]
Proposed term for providing benefits to customers related to reduction in state corporate tax	3 years		23 years

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Income Taxes [Line Items]

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Public Utilities, Proposed Term To Provide Customers With Benefits Related To Reduction In State Corporate Income Tax Rate

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Amount of deferred federal, state, and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, deferred national, regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-10

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