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Commitments and Contingencies - PVNGS Decommissioning Funding (Details) - PNM - Palo Verde Nuclear Generating Station - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |
Funding for decommissioning costs in qualified and non-qualified trust funds | $ 1.3 | $ 1.3 | $ 1.3
Estimated market value of trusts for decommissioning costs | $ 361.0 | $ 325.3 |

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition The cash outflow for the purchase of investments that will be held in a decommissioning trust fund. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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