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Financing - Borrowing Arrangements Between PNMR and Its Subsidiaries and Short-term Debt (Details) | Nov. 01, 2020 USD ($) | Feb. 26, 2018 USD ($) | Feb. 20, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 12, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 21, 2016 USD ($) | Nov. 30, 2016 USD ($) | Jan. 08, 2014 USD ($) bank
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Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 305,400,000 |  | $ 287,100,000 |  |  |
Letters of credit outstanding |  |  |  | 6,400,000 |  |  |  |  |
JPMorgan Chase Bank, N.A. |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 30,300,000 |  |  |  |  |
PNMR 2016 One Year Term Loan |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 100,000,000 |  | 100,000,000 | $ 100,000,000.0 |  |
PNMR Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  | 300,000,000 |  |  |  | $ 10,000,000.0 |
Short-term debt |  |  |  | 165,600,000 |  | 126,100,000 |  |  |
PNMR Revolving Credit Facility | Scenario, forecast |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity | $ 290,000,000.0 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Invested cash |  |  | $ 900,000 |  |  |  |  |  |
Subsequent Event | PNMR Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | 111,200,000 |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | 522,300,000 |  |  |  |  |  |
PNM Resources |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 265,600,000 |  | 226,100,000 |  |  |
PNM Resources | PNMR Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  |  | 2.76% |  |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Subsidiary loan agreements |  |  |  | $ 0 |  | 4,600,000 |  |  |
Letters of credit outstanding |  |  |  | 100,000 |  |  |  |  |
Texas-New Mexico Power Company | TNMP Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  | 75,000,000 |  |  |  |  |
Short-term debt |  |  |  | 0 |  | 0 |  |  |
Texas-New Mexico Power Company | TNMP Revolving Credit Facility | 9.50% due April 2019 |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount of bonds |  |  |  | 75,000,000 |  |  |  |  |
Texas-New Mexico Power Company | Subsequent Event |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Subsidiary loan agreements |  |  | 0 |  |  |  |  |  |
Invested cash |  |  | 0 |  |  |  |  |  |
Texas-New Mexico Power Company | Subsequent Event | TNMP Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | 51,000,000 |  |  |  |  |  |
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Subsidiary loan agreements |  |  |  | 0 |  | 0 |  |  |
Short-term debt |  |  |  | 39,800,000 |  | 61,000,000 |  |  |
Letters of credit outstanding |  |  |  | 2,500,000 |  |  |  |  |
Public Service Company of New Mexico | PNM 2017 New Mexico Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | $ 40,000,000.0 |  |  |  |
Public Service Company of New Mexico | PNM 2014 New Mexico Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  |  |  | $ 50,000,000.0
Number of participating lenders (in banks) | bank |  |  |  |  |  |  |  |  | 8
Public Service Company of New Mexico | PNM Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  | $ 400,000,000 |  |  |  | $ 40,000,000.0 |
Interest rates on outstanding borrowings |  |  |  | 2.59% |  |  |  |  |
Short-term debt |  |  |  | $ 39,800,000 |  | 35,000,000 |  |  |
Public Service Company of New Mexico | PNM Revolving Credit Facility | Scenario, forecast |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity | $ 360,000,000.0 |  |  |  |  |  |  |  |
Public Service Company of New Mexico | PNM 2014 New Mexico Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 0 |  | 26,000,000 |  |  |
Public Service Company of New Mexico | PNM 2017 New Mexico Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 0 |  | $ 0 |  |  |
Public Service Company of New Mexico | Subsequent Event |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Subsidiary loan agreements |  |  | 0 |  |  |  |  |  |
Invested cash |  |  | 0 |  |  |  |  |  |
Public Service Company of New Mexico | Subsequent Event | PNM Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | 340,100,000 |  |  |  |  |  |
Public Service Company of New Mexico | Subsequent Event | PNM 2014 New Mexico Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | $ 20,000,000 |  |  |  |  |  |
PNMR Development | Subsequent Event | PNMR 2018 Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  | $ 24,500,000.0 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Subsidiary loan agreements |  |  |  | $ 100,000,000 |  |  |  |  |

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