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Commitments and Contingencies - SJGS Decommissioning (Details) - Coal-Fired Electricity Generating Facility Demolition And Remediation Ordinance - San Juan Generating Station - PNM - USD ($) $ in Millions	Nov. 09, 2021	Dec. 31, 2023	Sep. 30, 2022
Public Utilities, General Disclosures [Line Items]
Initial funding requirement	$ 14.7
Surety bond		$ 46.0
Decrease in decommissioning obligation			$ 21.1

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- Definition

Loss Contingency, Decrease In Decommissioning Obligation

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- Definition

Loss Contingency, Surety Bond

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Public Utilities, Initial Funding Requirement

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