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Financing - Short-term Debt and Liquidity (Details) - USD ($) | Nov. 01, 2020 | Apr. 24, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016
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Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 303,100,000 | $ 287,100,000 |
Letters of credit outstanding |  |  | 6,200,000 |  |
Maturities and other repayments due in next 12 months |  |  | 283,500,000 |  |
Maturities and other repayments due in the remainder of year two |  |  | $ 106,800,000 |  |
Subsequent event |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | $ 605,300,000 |  |  |
PNMR 2016 One-Year Term Loan |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 1.83% |  |
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 | Forecast |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity | $ 290,000,000.0 |  |  |  |
PNMR | Subsequent event |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 137,700,000 |  |  |
Consolidated invested cash |  | 1,500,000 |  |  |
PNMR | PNMR Revolving Credit Facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 2.19% |  |
PNMR | Revolving credit facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  | $ 300,000,000.0 |  |
Short-term debt |  |  | 164,900,000 | 126,100,000 |
Public Service Company of New Mexico |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  |  | 16,200,000 | 61,000,000 |
Letters of credit outstanding |  |  | 2,500,000 |  |
Maturities and other repayments due in next 12 months |  |  | 232,000,000 |  |
Maturities and other repayments due in the remainder of year two |  |  | 450,000,000 |  |
Public Service Company of New Mexico | Subsequent event |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 389,700,000 |  |  |
Consolidated invested cash |  | 0 |  |  |
Public Service Company of New Mexico | 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 |  |
Public Service Company of New Mexico | Lines of credit | Subsequent event |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 43,000,000 |  |  |
Public Service Company of New Mexico | PNM Revolving Credit Facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  |  |  | $ 40,000,000.0
Weighted-average interest rate for short-term debt |  |  | 2.11% |  |
Public Service Company of New Mexico | PNM Revolving Credit Facility | Forecast |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity | $ 360,000,000.0 |  |  |  |
Public Service Company of New Mexico | Revolving credit facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  | $ 400,000,000.0 |  |
Short-term debt |  |  | 16,200,000 | 35,000,000 |
TNMP |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt |  |  | 22,000,000 | 0 |
Letters of credit outstanding |  |  | 100,000 |  |
Intercompany borrowings |  |  | 6,300,000 |  |
Short-term debt – affiliate |  |  | 6,300,000 | 4,600,000 |
Maturities and other repayments due |  |  | $ 0 |  |
TNMP | Subsequent event |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Remaining borrowing capacity |  | 34,900,000 |  |  |
Consolidated invested cash |  | 0 |  |  |
TNMP | Subsequent event | Affiliated entity |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt – affiliate |  | $ 5,000,000 |  |  |
TNMP | PNM Revolving Credit Facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Weighted-average interest rate for short-term debt |  |  | 1.94% |  |
TNMP | Revolving credit facility |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Financing capacity |  |  | $ 75,000,000.0 |  |
Short-term debt |  |  | 22,000,000 | $ 0 |
Maturities and other repayments due in 2018 |  |  | 75,000,000 |  |
TNMP | Revolving credit facility | First mortgage bonds |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Collateral amount |  |  | $ 75,000,000 |  |

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