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Financing - Short-Term Debt and Liquidity (Narrative) (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2024 USD ($) extension_option | Dec. 31, 2024 USD ($) extension_option | May 20, 2022 USD ($) | May 13, 2022 USD ($) | Mar. 11, 2022 USD ($)
Short-term Debt [Line Items] |  |  |  |  |
Letters of credit outstanding |  | $ 3,100,000 |  |  |
JPMorgan Chase Bank, N.A. |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Letters of credit outstanding |  | 30,300,000 |  |  |
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 |  |
TNMP |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Letters of credit outstanding |  | 0 |  |  |
TNMP | Revolving Credit Facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity | $ 200,000,000 | $ 200,000,000 |  | $ 100,000,000 | $ 100,000,000
Number of extensions | extension_option | 2 | 2 |  |  |
Extension period | 1 year | 1 year |  |  |
TNMP | Revolving Credit Facility | 9.50% due April 2019 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Collateral amount |  |  |  | $ 100,000,000 |
TNMP | Revolving Credit Facility | First Mortgage Bonds Due 2029 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Collateral amount |  | $ 200,000,000 |  |  |
TXNM Revolving Credit Facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  | $ 300,000,000.0 |  |  |
TXNM Revolving Credit Facility | PNM Resources |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Interest rates on outstanding borrowings (as a percent) |  | 5.96% |  |  |
PNM Revolving Credit Facility | PNM Resources |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Interest rates on outstanding borrowings (as a percent) |  | 5.73% |  |  |
PNM Revolving Credit Facility | PNM |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  | $ 400,000,000.0 |  |  |
TNMP Revolving Credit Facility | PNM Resources |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Interest rates on outstanding borrowings (as a percent) |  | 5.37% |  |  |
PNM New Mexico Credit Facility | PNM Resources |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Interest rates on outstanding borrowings (as a percent) |  | 5.81% |  |  |

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