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Commitments and Contingencies - PVNG Liability and Insurance Matters (Details) - PNM - Palo Verde Nuclear Generating Station | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) generatingUnit | Jan. 31, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Number of units (in generating units) | generatingUnit | 3 |
Nuclear Plant |  |
Public Utilities, General Disclosures [Line Items] |  |
Number of units (in generating units) | generatingUnit | 3 |
Maximum potential assessment per incident | $ 37,700,000 | $ 36,300,000
Annual payment limitation related to incident | 5,600,000 | 5,400,000
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 |  | $ 4,900,000
Nuclear Plant | Commercial Providers |  |
Public Utilities, General Disclosures [Line Items] |  |
Liability insurance coverage | 500,000,000 |
Nuclear Plant | Industry Wide Retrospective Assessment Program |  |
Public Utilities, General Disclosures [Line Items] |  |
Liability insurance coverage | 15,800,000,000 |
Nuclear Plant | Maximum |  |
Public Utilities, General Disclosures [Line Items] |  |
Liability insurance coverage | $ 16,300,000,000 |

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