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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Expense) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits, interest on income taxes expense | $ 0 | $ 0 | $ 0
PNMR |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | 15,154,000 | 13,714,000 | 13,152,000
Additions based on tax positions |  | 1,444,000 | 305,000
Reductions based on tax positions | (277,000) |  |
Additions for tax positions of prior years | 259,000 |  | 257,000
Reductions for tax positions of prior years |  | (4,000) |
Ending balance | 15,136,000 | 15,154,000 | 13,714,000
Unrecognized tax benefits that would impact effective tax rate | 14,600,000 |  |
PNM |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | 12,201,000 | 10,771,000 | 10,230,000
Additions based on tax positions |  | 1,437,000 | 295,000
Reductions based on tax positions | (294,000) |  |
Additions for tax positions of prior years | 239,000 |  | 246,000
Reductions for tax positions of prior years |  | (7,000) |
Ending balance | 12,146,000 | 12,201,000 | 10,771,000
Unrecognized tax benefits that would impact effective tax rate | 11,600,000 |  |
Unrecognized tax benefits, interest on income taxes expense | 0 | 0 | 0
TNMP |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | 151,000 | 141,000 | 119,000
Additions based on tax positions | 17,000 | 7,000 | 11,000
Additions for tax positions of prior years | 20,000 | 3,000 | 11,000
Ending balance | 188,000 | 151,000 | 141,000
Unrecognized tax benefits that would impact effective tax rate | 200,000 |  |
Unrecognized tax benefits, interest on income taxes expense | $ 0 | $ 0 | $ 0

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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