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Commitments and Contingencies - PVNGS Liability and Insurance Matters (Narrative) (Details) - PNM - Nuclear Plant - PVNGS (Nuclear) | Dec. 31, 2024 USD ($) bond | Dec. 31, 2023 USD ($) | Jan. 31, 2023 USD ($)
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Public Utilities, General Disclosures [Line Items] |  |  |
Maximum potential assessment per incident |  | $ 165,900,000 | $ 36,300,000
Annual payment limitation related to incident |  | $ 24,700,000 | $ 5,400,000
Number of nuclear power plants owned | bond | 3 |  |
Aggregate amount of all risk insurance | $ 2,800,000,000 |  |
Sublimit amount for non-nuclear property damage losses | 2,250,000,000 |  |
Retrospective premium assessment | 5,100,000 |  |
Commercial Providers |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Liability insurance coverage | 500,000,000 |  |
Industry Wide Retrospective Assessment Program |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Liability insurance coverage | 15,800,000,000 |  |
Maximum |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Liability insurance coverage | $ 16,300,000,000 |  |

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