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Commitments and Contingencies - PVNG Liability and Insurance Matters (Details) - Public Service Company of New Mexico - Palo Verde Nuclear Generating Station | 12 Months Ended |
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Dec. 31, 2022 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] |  |
Ownership percentage in nuclear reactor | 10.20% |
Number of units (in generating units) | generatingUnit | 3 |
Maximum potential assessment per incident | $ 42,100,000 |
Annual payment limitation related to incident | 6,200,000 |
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 | 5,400,000 |
Nuclear Plant | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Maximum potential assessment per incident |  | $ 31,200,000
Annual payment limitation related to incident |  | 4,700,000
Retrospective premium assessment |  | $ 5,100,000
Nuclear Plant | Commercial Providers |  |
Public Utilities, General Disclosures [Line Items] |  |
Liability insurance coverage | 450,000,000 |
Nuclear Plant | Industry Wide Retrospective Assessment Program |  |
Public Utilities, General Disclosures [Line Items] |  |
Liability insurance coverage | 13,200,000,000 |
Nuclear Plant | Maximum |  |
Public Utilities, General Disclosures [Line Items] |  |
Liability insurance coverage | $ 13,700,000,000 |

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