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Financing - Short-term Debt (Details) - USD ($) | Jul. 24, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Jan. 08, 2014
--- | --- | --- | --- | ---
Short-term Debt [Line Items] |  |  |  |
Short-term debt |  | $ 187,600,000 | $ 105,600,000 |
Subsequent Event [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 719,700,000 |  |  |
PNMR Term Loan Agreement [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term Debt, Weighted Average Interest Rate |  | 1.04% |  |
Short-term debt |  | $ 100,000,000 | 100,000,000 |
PNM Resources [Member] | Subsequent Event [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 293,200,000 |  |  |
Restricted Cash and Investments | 1,900,000 |  |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 353,600,000 |  |  |
Restricted Cash and Investments | 0 |  |  |
Public Service Company of New Mexico [Member] | Subsequent Event [Member] | Affiliated Entity [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt – affiliate | 18,700,000 |  |  |
Public Service Company of New Mexico [Member] | Local Lines of Credit [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Debt Instruments, NMPRC Approved credit facility |  |  |  | $ 50,000,000
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] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 30,000,000 |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 42,900,000 |  |  |
Restricted Cash and Investments | 0 |  |  |
Texas-New Mexico Power Company [Member] | Subsequent Event [Member] | Affiliated Entity [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt – affiliate | $ 13,200,000 |  |  |
Texas-New Mexico Power Company [Member] | Intercompany loan agreements [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt - affiliate |  | 4,100,000 |  |
Revolving Credit Facility [Member] | PNM Resources [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 300,000,000.0 |  |
Short-term Debt, Weighted Average Interest Rate |  | 1.69% |  |
Short-term debt |  | $ 7,500,000 | 600,000 |
Revolving Credit Facility [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 400,000,000.0 |  |
Short-term Debt, Weighted Average Interest Rate |  | 1.44% |  |
Short-term debt |  | $ 31,100,000 | 0 |
Revolving Credit Facility [Member] | Texas-New Mexico Power Company [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 75,000,000.0 |  |
Short-term Debt, Weighted Average Interest Rate |  | 1.19% |  |
Short-term debt |  | $ 29,000,000 | $ 5,000,000 |
Revolving Credit Facility [Member] | Texas-New Mexico Power Company [Member] | First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Debt Instrument, Collateral Amount |  | $ 75,000,000 |  |
Local Lines of Credit [Member] | Public Service Company of New Mexico [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term Debt, Weighted Average Interest Rate |  | 1.44% |  |

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