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Financing, Short-term Debt (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Line of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] | Mar. 31, 2014 PNM Resources [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 PNM Resources [Member] Revolving Credit Facility [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Mar. 31, 2014 Public Service Company of New Mexico [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Revolving Credit Facility [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Texas-New Mexico Power Company [Member] | Mar. 31, 2014 Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member] | Apr. 25, 2014 Available Borrowing Capacity [Member] | Apr. 25, 2014 Available Borrowing Capacity [Member] PNM Resources [Member] | Apr. 25, 2014 Available Borrowing Capacity [Member] Public Service Company of New Mexico [Member] | Apr. 25, 2014 Available Borrowing Capacity [Member] Texas-New Mexico Power Company [Member] | Apr. 25, 2014 Subsequent Event [Member] PNM Resources [Member] | Apr. 25, 2014 Subsequent Event [Member] Public Service Company of New Mexico [Member] | Apr. 25, 2014 Subsequent Event [Member] Texas-New Mexico Power Company [Member] | Apr. 25, 2014 Affiliated Entity [Member] Intercompany loan agreements [Member] Texas-New Mexico Power Company [Member] | Mar. 31, 2014 PNMR Term Loan Agreement [Member] | Dec. 31, 2013 PNMR Term Loan Agreement [Member] | Mar. 31, 2014 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] Revolving Credit Facility [Member] | Mar. 31, 2014 Local Lines of Credit [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2013 Local Lines of Credit [Member] Public Service Company of New Mexico [Member] | Apr. 22, 2013 PNM Term Loan Agreement [Member] Notes Payable to Banks [Member] | Mar. 31, 2014 PNM 2014 Term Loan Agreement [Member] Public Service Company of New Mexico [Member]
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Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 806,900,000 | $ 291,400,000 | $ 396,800,000 | $ 68,700,000 |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 300,000,000.0 |  |  |  | 400,000,000.0 |  |  |  | 75,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |
Short-term Debt, Weighted Average Interest Rate | 1.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt | 100,000,000 | 149,200,000 | 100,000,000 | 149,200,000 | 0 | 0 | 0 | 49,200,000 | 0 | 49,200,000 |  |  | 0 | 0 |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  | 0 | 0 | 75,000,000 |
Short-term debt – affiliate |  |  |  |  |  |  |  |  |  |  | 31,200,000 | 29,400,000 |  |  |  |  |  |  |  |  |  | 41,200,000 |  |  |  |  |  |  |
Restricted Cash and Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 9,300,000 | $ 0 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.11%

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