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Financing - Borrowing Arrangements Between PNMR and Its Subsidiaries and Short-term Debt (Details) | Nov. 01, 2020 USD ($) | Feb. 21, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 21, 2016 USD ($) | Nov. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 08, 2014 USD ($) bank
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Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  | $ 287,100,000 |  |  | $ 250,600,000 |
Letters of credit outstanding |  |  | 6,200,000 |  |  |  |
JPMorgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding |  |  | 30,300,000 |  |  |  |
PNMR Term Loan Agreement [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  | 0 |  |  | 150,000,000 |
PNMR 2016 One Year Term Loan [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  | 100,000,000 | $ 100,000,000.0 |  |  |
PNMR Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  | 300,000,000 |  | $ 10,000,000.0 |  |
Short-term debt |  |  | 126,100,000 |  |  | 41,600,000 |
PNMR Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity | $ 290,000,000.0 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Invested cash |  | $ 1,500,000 |  |  |  |  |
Subsequent Event [Member] | PNMR Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Available borrowing capacity |  | 149,500,000 |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Available borrowing capacity |  | 607,600,000 |  |  |  |  |
Texas-New Mexico Power Company [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Subsidiary loan agreements |  |  | 4,600,000 |  |  | 11,800,000 |
Short-term debt |  |  | 0 |  |  | 59,000,000 |
Letters of credit outstanding |  |  | 100,000 |  |  |  |
Texas-New Mexico Power Company [Member] | TNMP Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  | 75,000,000 |  |  |  |
Short-term debt |  |  | 0 |  |  | 59,000,000 |
Texas-New Mexico Power Company [Member] | TNMP Revolving Credit Facility [Member] | First Mortgage Bonds Due 2019, Series 2009A, at 9.50% [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of bonds |  |  | 75,000,000 |  |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Subsidiary loan agreements |  | 7,400,000 |  |  |  |  |
Invested cash |  | 0 |  |  |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] | TNMP Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Available borrowing capacity |  | 66,900,000 |  |  |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Subsidiary loan agreements |  |  | 0 |  |  |  |
Short-term debt |  |  | 61,000,000 |  |  | 0 |
Letters of credit outstanding |  |  | $ 2,500,000 |  |  |  |
Public Service Company of New Mexico [Member] | New Mexico Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  | $ 50,000,000.0
Number of participating lenders (in banks) | bank |  |  |  |  |  |  | 9
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  | 1.81% |  |  |  |
Public Service Company of New Mexico [Member] | PNM Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity |  |  | $ 400,000,000 |  | $ 40,000,000.0 |  |
Interest rates on outstanding borrowings |  |  | 1.82% |  |  |  |
Short-term debt |  |  | $ 35,000,000 |  |  | 0 |
Public Service Company of New Mexico [Member] | PNM Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Financing capacity | $ 360,000,000.0 |  |  |  |  |  |
Public Service Company of New Mexico [Member] | New Mexico Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  | 26,000,000 |  |  | 0 |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Subsidiary loan agreements |  | 0 |  |  |  |  |
Invested cash |  | 0 |  |  |  |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | PNM Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Available borrowing capacity |  | 366,200,000 |  |  |  |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | New Mexico Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Available borrowing capacity |  | $ 25,000,000 |  |  |  |  |
PNM Resources [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  | $ 226,100,000 |  |  | $ 191,600,000 |
PNM Resources [Member] | PNMR Revolving Credit Facility [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Interest rates on outstanding borrowings |  |  | 1.98% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Subsidiary loan agreements |  |  | $ 100,000,000 |  |  |  |

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