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Financing - Short-term Debt and Liquidity (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) extension_option | Feb. 18, 2022 USD ($) | Dec. 31, 2020 USD ($)
Short-term Debt [Line Items] |  |  |
Financing capacity | $ 40,000,000 |  |
Short-term debt | 62,700,000 |  | $ 32,000,000
Letters of credit outstanding | 3,400,000 |  |
JPMorgan Chase Bank, N.A. |  |  |
Short-term Debt [Line Items] |  |  |
Letters of credit outstanding | 30,300,000 |  |
PNM Resources |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | 54,900,000 |  | 12,000,000
PNMR Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Financing capacity | 300,000,000 |  |
Short-term debt | $ 54,900,000 |  | 12,000,000
PNMR Revolving Credit Facility | PNM Resources |  |  |
Short-term Debt [Line Items] |  |  |
Interest rates on outstanding borrowings | 1.61% |  |
PNM Revolving Credit Facility | PNM Resources |  |  |
Short-term Debt [Line Items] |  |  |
Interest rates on outstanding borrowings | 1.35% |  |
TNMP Revolving Credit Facility | PNM Resources |  |  |
Short-term Debt [Line Items] |  |  |
Interest rates on outstanding borrowings | 0.85% |  |
PNMR Development Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | $ 0 |  | 10,000,000
PNM |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | 7,400,000 |  | 10,000,000
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 |  |
Short-term debt | 7,400,000 |  | 0
PNM | PNM 2017 New Mexico Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | 0 |  | 10,000,000
TNMP |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | 400,000 |  | 0
Letters of credit outstanding | 0 |  |
TNMP | TNMP Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Financing capacity | 75,000,000 |  |
Short-term debt | 400,000 |  | $ 0
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 |  |
PNM and TNMP | PNMR Development Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Letters of credit outstanding | $ 0 |  |
Revolving Credit Facility | TNMP | First Mortgage Bonds at 9.50% due 2019 |  |  |
Short-term Debt [Line Items] |  |  |
Number of extension options | extension_option | 2 |  |
Extension option period | 1 year |  |
Subsequent Event | PNM Resources |  |  |
Short-term Debt [Line Items] |  |  |
Consolidated invested cash |  | $ 900,000 |
Subsequent Event | PNMR Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Available borrowing capacity |  | 296,600,000 |
Subsequent Event | Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Available borrowing capacity |  | 799,800,000 |
Subsequent Event | PNM |  |  |
Short-term Debt [Line Items] |  |  |
Consolidated invested cash |  | 1,000,000 |
Subsequent Event | PNM | PNM Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Available borrowing capacity |  | 400,000,000 |
Subsequent Event | PNM | PNM 2017 New Mexico Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Available borrowing capacity |  | 40,000,000 |
Subsequent Event | TNMP |  |  |
Short-term Debt [Line Items] |  |  |
Consolidated invested cash |  | 0 |
Subsequent Event | TNMP | TNMP Revolving Credit Facility |  |  |
Short-term Debt [Line Items] |  |  |
Available borrowing capacity |  | $ 63,200,000 |

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