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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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- Definition 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 + Details
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