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Regulatory and Rate Matters - Four Corners Abandonment Application (Narrative) (Details) - Four Corners - PNM - USD ($) $ in Millions |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 08, 2021 | Nov. 01, 2020 | Aug. 31, 2024 | Nov. 30, 2020 | Sep. 30, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Payments for relief from obligations |  | $ 75.0 |  | $ 15.0 |
Final payment for relief from obligations |  |  |  | $ 60.0 |
Request issuance of energy transition bonds | $ 300.0 |  |  |  |
Regulatory disallowance |  |  |  |  | $ 3.7
Reimbursement agreement payment |  |  | $ 15.0 |  |
PNM |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Ownership percentage by noncontrolling owners |  | 13.00% |  |  |

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