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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	Sep. 30, 2024	Dec. 31, 2023
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	$ 12.9	$ 11.0

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Public Utilities, Commitments And Contingencies [Line Items]

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Amount of loss contingency liability.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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