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Financing - Financing Activities (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 11, 2015 | May. 08, 2015 | Dec. 31, 2014 | Sep. 30, 2015 | Jun. 01, 2015 | Mar. 09, 2015 | Dec. 22, 2014 | Mar. 05, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  | $ 105,600,000 | $ 102,600,000 |  |  |  |
Derivative, Fixed Interest Rate |  |  |  | 2.027% |  |  |  |
PNM Term Loan Agreement [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  | $ 75,000,000.0
PNMR 2015 Term Loan Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 150,000,000.0 |  |
Interest rate |  |  |  | 1.21% |  |  |  |
Unsecured Debt [Member] | Senior unsecured note, due 2015, at 9 point 25 percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt outstanding |  |  | $ 118,800,000 |  |  |  |  |
Stated interest rate |  |  | 9.25% |  |  |  |  |
Public Service Company of New Mexico [Member] | PNM 2014 Term Loan Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 175,000,000.0
Repayments of Debt | $ 175,000,000 |  |  |  |  |  |  |
Public Service Company of New Mexico [Member] | PNM 2014 Multi-Draw Term Loan Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 125,000,000.0 |  |  | $ 125,000,000.0 |
Proceeds from (repayments of) debt |  | $ 25,000,000 | $ 100,000,000 |  |  |  |  |
Interest rate |  |  |  | 0.78% |  |  |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | Senior unsecured note, Due 2025, at 3 point 850 percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt outstanding | $ 250,000,000 |  |  |  |  |  |  |
Stated interest rate | 3.85% |  |  |  |  |  |  |
Public Service Company of New Mexico [Member] | Unsecured notes, Pollution control revenue bonds [Member] | Senior unsecured note, PCRB Due 2043, at 4 percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt outstanding |  |  | $ 39,300,000 |  |  |  |  |
Stated interest rate |  |  |  |  | 2.40% |  |  |
Public Service Company of New Mexico [Member] | Unsecured notes, Pollution control revenue bonds [Member] | Senior unsecured note, PCRB Due 2043, at 2 point 4 percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 39,300,000 |  |  |
Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  | $ 700,000 |  |  |  |

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