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Commitments and Contingencies - Nuclear Spent Fuel and Waste Disposal (Details) - PNM - Nuclear spent fuel and waste disposal - Palo Verde Nuclear Generating Station - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Public Utilities, Commitments And Contingencies [Line Items] |  |
Estimate of possible loss | $ 55.6 |
Other Deferred Credits |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |
Loss contingency accrual | $ 14.6 | $ 13.4

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