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Financing - Short-term Debt and Liquidity (Details) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) Extension | Nov. 01, 2020 USD ($) | Oct. 20, 2017 USD ($) | Jul. 28, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 30, 2016 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term debt | $ 266,500,000 |  |  |  | $ 287,100,000 |
Letters of credit outstanding | 6,400,000 |  |  |  |  |
Maturities and other repayments due in next 12 months | 265,700,000 |  |  |  |  |
Maturities and other repayments due in the remainder of year two | $ 102,300,000 |  |  |  |  |
Subsequent event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Remaining borrowing capacity |  |  | $ 635,000,000 |  |  |
PNMR | Subsequent event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Remaining borrowing capacity |  |  | 118,500,000 |  |  |
Short-term debt – affiliate |  |  | 0 |  |  |
Consolidated invested cash |  |  | 1,500,000 |  |  |
PNMR 2016 One-Year Term Loan |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Weighted-average interest rate for short-term debt | 2.09% |  |  |  |  |
Term of loan | 1 year |  |  |  |  |
Short-term debt | $ 100,000,000 |  |  |  | 100,000,000 |
PNMR Revolving Credit Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity |  |  |  |  |  | $ 10,000,000.0
PNMR Revolving Credit Facility | PNMR |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Weighted-average interest rate for short-term debt | 2.49% |  |  |  |  |
PNMR Revolving Credit Facility | Forecast |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity |  | $ 290,000,000.0 |  |  |  |
PNM |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term debt | $ 0 |  |  |  | 61,000,000 |
Letters of credit outstanding | 2,500,000 |  |  |  |  |
PNM | Subsequent event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Remaining borrowing capacity |  |  | 397,500,000 |  |  |
Consolidated invested cash |  |  | 50,500,000 |  |  |
PNM | Lines of credit |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
NMPRC approved credit facility | 50,000,000 |  |  |  |  |
Short-term debt | 0 |  |  |  | 26,000,000 |
Maturities and other repayments due | 50,000,000 |  |  |  |  |
PNM | Lines of credit | Subsequent event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Remaining borrowing capacity |  |  | 50,000,000 |  |  |
PNM | Senior Unsecured Note Agreement (SUNs) | Senior Unsecured Notes |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt issued |  |  |  | $ 450,000,000.0 |  |
PNM | PNM Revolving Credit Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity |  |  |  |  |  | $ 40,000,000.0
PNM | PNM Revolving Credit Facility | Forecast |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity |  | $ 360,000,000.0 |  |  |  |
TNMP |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Letters of credit outstanding | 100,000 |  |  |  |  |
Intercompany borrowings | 0 |  |  |  |  |
Short-term debt – affiliate | 0 |  |  |  | 4,600,000 |
Maturities and other repayments due in 2018 | 0 |  |  |  |  |
TNMP | Subsequent event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Remaining borrowing capacity |  |  | 69,000,000 |  |  |
Consolidated invested cash |  |  | 0 |  |  |
Revolving credit facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity | 300,000,000.0 |  |  |  |  |
Short-term debt | 166,500,000 |  |  |  | 126,100,000 |
Revolving credit facility | PNM |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity | 400,000,000.0 |  |  |  |  |
Short-term debt | 0 |  |  |  | 35,000,000 |
Revolving credit facility | TNMP |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Financing capacity | $ 75,000,000.0 |  |  |  |  |
Number of extension options | Extension | 2 |  |  |  |  |
Extension option on term | 1 year |  |  |  |  |
Short-term debt | $ 0 |  |  |  | $ 0 |
Revolving credit facility | TNMP | First mortgage bonds |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Collateral amount | $ 75,000,000 |  |  |  |  |
Affiliated entity | TNMP | Subsequent event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term debt – affiliate |  |  | $ 0 |  |  |

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