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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 ($) extension_option | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | May 13, 2022 USD ($) | Mar. 10, 2022 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Short-term Debt [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 3,100,000 |  |  |
PNMR Development |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | 0 | $ 5,300,000 |  |
Revolving credit facility | PNM 2022 Delayed-Draw Term Loan | Line of credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  | $ 225,000,000
PNMR Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity | $ 285,000,000 |  |  |  |  |  |
PNMR Revolving Credit Facility | WEB LOC Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 30,300,000 |  |  |
PNM |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 |  |  |
PNM | PNMR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | 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 | $ 380,000,000 |  |  |  |  |  |
TNMP |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 |  |  |
TNMP | PNMR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | $ 0 |  |  |
TNMP | PNM Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 6.48% |  |  |
TNMP | PNM New Mexico Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 6.44% |  |  |
TNMP | TNMP Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 6.10% |  |  |
PNMR Development | PNMR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | $ 9,500,000 |  |  |
PNMR Development | PNMR Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  | 6.71% |  |  |
Revolving credit facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  |  | $ 300,000,000 |  |  |
Number of extensions | extension_option |  | 2 |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |
Revolving credit facility | PNM |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  |  | $ 400,000,000 |  |  |
Number of extensions exercised | extension_option | 1 |  |  |  |  |  |
Extension period exercised | 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 |  | 1 year |  |  |  |
Number of extensions exercised | extension_option | 1 |  |  |  |  |  |
Extension period exercised | 1 year |  |  |  |  |  |
Revolving credit facility | TNMP | First mortgage bonds |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Collateral amount |  |  |  |  |  | $ 100,000,000 |
Senior Notes | PNM |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  | $ 198,000,000
TNMP Revolving Credit Facility | TNMP |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  | $ 75,000,000 |  |  |  |
TNMP Revolving Credit Facility | TNMP | First mortgage bonds |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Collateral amount |  |  | $ 75,000,000 |  |  |  |

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