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Regulatory and Rate Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 03, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory assets |  | $ 514,258 | $ 557,790
Regulatory liabilities |  | 841,393 | 850,228
Public Service Company of New Mexico |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory assets |  | 428,981 | 457,953
Regulatory liabilities |  | 653,830 | 664,873
Public Service Company of New Mexico | COVID-19 cost savings |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory liabilities |  | 900 | 900
COVID-19 | Public Service Company of New Mexico | COVID-19 cost savings |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory liabilities |  | 900 | 900
Deferred COVID-19 costs | Public Service Company of New Mexico |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory assets |  | 6,896 | 8,761
Deferred COVID-19 costs | COVID-19 | Public Service Company of New Mexico |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory assets |  | 6,900 | $ 8,800
Decrease in other regulatory assets |  | $ 2,700 |
COVID-19 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Temporary mandatory moratorium on disconnection period | 100 days |  |
Disconnection transition period | 90 days |  |

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