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Financing - Short-term Debt and Liquidity (Details) | Jan. 26, 2023 USD ($) extension_option | May 20, 2022 USD ($) extension_option | Mar. 11, 2022 USD ($) extension_option | Dec. 31, 2022 USD ($) | May 13, 2022 USD ($) | Mar. 10, 2022 USD ($) | Dec. 31, 2021 USD ($) | May 18, 2021 USD ($)
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Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 3,400,000 |  |  |  |
JPMorgan Chase Bank, N.A. |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 30,300,000 |  |  |  |
PNMR Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  | $ 300,000,000 |  |  |  |
PNMR Revolving Credit Facility | PNM Resources |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  |  | 5.90% |  |  |  |
PNM Revolving Credit Facility | PNM Resources |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  |  | 5.67% |  |  |  |
TNMP Revolving Credit Facility | PNM Resources |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  |  | 5.29% |  |  |  |
PNM New Mexico Credit Facility | PNM Resources |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  |  | 5.68% |  |  |  |
PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 0 |  |  |  |
PNM | Lines of credit |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
NMPRC approved credit facility |  | $ 40,000,000 |  |  |  |  |  |
PNM | PNM Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  | 400,000,000 |  |  |  |
TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 0 |  |  |  |
TNMP | TNMP Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  | $ 75,000,000 |
TNMP | TNMP Revolving Credit Facility | First Mortgage Bonds at 9.50% due 2019 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of bonds |  |  |  |  |  |  | $ 75,000,000 |
PNMR Development |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  |  | $ 40,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Number of extensions | extension_option |  | 2 |  |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |  |
Revolving Credit Facility | TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  | $ 100,000,000 |  | $ 100,000,000 | $ 75,000,000 |  |
Number of extensions | extension_option |  |  | 2 |  |  |  |  |
Extension period |  |  | 1 year |  |  |  |  |
Revolving Credit Facility | TNMP | First Mortgage Bonds at 9.50% due 2019 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Collateral amount |  |  |  |  | $ 100,000,000 |  |  |
Subsequent Event | PNMR Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity | $ 285,000,000 |  |  |  |  |  |  |
Subsequent Event | PNM | PNM Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity | $ 380,000,000 |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |
Extension exercised | extension_option | 1 |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |
Extension exercised | extension_option | 1 |  |  |  |  |  |  |

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