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Commitments and Contingencies - SJGS Decommissioning (Narrative) (Details) - Coal-Fired Electricity Generating Facility Demolition and Remediation Ordinance - San Juan Generating Station - PNM - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2024 | Sep. 30, 2022 | Nov. 09, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |
Initial funding requirement | $ 14.7 | $ 7.0 |  |
Surety bond |  |  |  | $ 46.0
Decrease in decommissioning obligation |  |  | $ 21.1 |

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