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Income Taxes (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Aug. 18, 2023	Sep. 30, 2023	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective tax rate		16.05%
Income tax assessment		$ 0.3
Deferred federal, state and local, income taxes		22.9
PNM
Income Tax Contingency [Line Items]
Proposed rate credits	$ 115.0	$ 115.0
Effective tax rate		18.90%
Income tax assessment		$ 0.2
Deferred federal, state and local, income taxes		$ 14.3
TNMP
Income Tax Contingency [Line Items]
Effective tax rate		15.07%
Income tax assessment		$ 0.1
Deferred federal, state and local, income taxes		$ 8.6
NMPRC
Income Tax Contingency [Line Items]
Period of time for proposed return to customers the benefit of the reduction in federal corporate income tax rate			23 years

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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.

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-Topic 740
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Estimated amount of loss resulting from an adverse tax position.

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