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Financing - Short-term Debt (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Oct. 21, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |  |
Short-term debt | $ 355,900,000 |  | $ 250,600,000
Letters of credit outstanding | $ 36,500,000 |  |
Subsequent event [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Remaining borrowing capacity |  | $ 592,800,000 |
PNMR Term Loan Agreement [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate for short-term debt | 1.38% |  |
Short-term debt | $ 150,000,000 |  | 150,000,000
Notes Payable to Banks [Member] | PNMR Term Loan Agreement [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Term of loan | 12 months |  |
Borrowings under 12-month term loan | $ 150,000,000.0 |  |
PNM Resources [Member] | Subsequent event [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Remaining borrowing capacity |  | 100,400,000 |
Consolidated invested cash |  | 1,800,000 |
PNM Resources [Member] | PNMR Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate for short-term debt | 1.78% |  |
PNM Resources [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Financing capacity | $ 300,000,000.0 |  |
Short-term debt | 163,500,000 |  | 41,600,000
Public Service Company of New Mexico [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | 42,400,000 |  | 0
Letters of credit outstanding | 2,500,000 |  |
Public Service Company of New Mexico [Member] | Subsequent event [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Remaining borrowing capacity |  | 373,500,000 |
Consolidated invested cash |  | 0 |
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] |  |  |
Short-term Debt [Line Items] |  |  |
NMPRC approved credit facility | $ 50,000,000 |  |
Weighted-average interest rate for short-term debt | 1.68% |  |
Short-term debt | $ 20,000,000 |  | 0
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] | Subsequent event [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Remaining borrowing capacity |  | 44,000,000 |
Public Service Company of New Mexico [Member] | PNMR Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate for short-term debt | 1.66% |  |
Public Service Company of New Mexico [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Financing capacity | $ 400,000,000.0 |  |
Short-term debt | 22,400,000 |  | 0
Texas-New Mexico Power Company [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt | 0 |  | 59,000,000
Letters of credit outstanding | 100,000 |  |
Short-term debt – affiliate | 0 |  | 11,800,000
Texas-New Mexico Power Company [Member] | Subsequent event [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Remaining borrowing capacity |  | 74,900,000 |
Consolidated invested cash |  | 300,000 |
Texas-New Mexico Power Company [Member] | Subsequent event [Member] | Affiliated Entity [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term debt – affiliate |  | $ 0 |
Texas-New Mexico Power Company [Member] | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Financing capacity | 75,000,000.0 |  |
Short-term debt | 0 |  | $ 59,000,000
Texas-New Mexico Power Company [Member] | Revolving Credit Facility [Member] | First Mortgage Bonds, Due 2014, Series 2009A, at 9.50% [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Collateral amount | $ 75,000,000 |  |

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