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Financing Short-term Debt (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Oct. 31, 2011 | Dec. 31, 2013 Extensions | Dec. 31, 2012 | Dec. 31, 2013 Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Apr. 30, 2009 Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Oct. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Maximum [Member] | Jan. 08, 2014 New Mexico Revolving Credit Facility [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 PNMR Term Loan Agreement [Member] | Dec. 31, 2012 PNMR Term Loan Agreement [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 PNM Term Loan Agreement [Member] Public Service Company of New Mexico [Member] | Feb. 22, 2013 Borrowings from PNMR [Member] Texas-New Mexico Power Company [Member] | Feb. 21, 2014 Available Borrowing Capacity [Member] | Feb. 21, 2014 Subsequent Event [Member] | Feb. 21, 2014 Subsequent Event [Member] Texas-New Mexico Power Company [Member] | Feb. 21, 2014 Subsequent Event [Member] Public Service Company of New Mexico [Member] | Feb. 21, 2014 Subsequent Event [Member] New Mexico Revolving Credit Facility [Member] Public Service Company of New Mexico [Member]
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Related Parties, Current |  |  |  | $ 29,400,000 | $ 28,300,000 |  | $ 32,500,000 | $ 0 |  | $ 100,000,000 |  |  |  |  |  | $ 35,800,000 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 300,000,000 |  |  |  |  | 75,000,000 |  |  | 400,000,000 |  | 50,000,000 |  |  |  |  |  |  |  |  |  |
Securities Received as Collateral |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Number of Extension Options |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Extension Option, Years |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of debt to capital, maximum (as a percent) | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 1.02% |  | 1.42% | 1.42% |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  | 0 | 37,600,000 | 0 | 0 |  | 49,200,000 | 21,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  | 149,200,000 | 158,700,000 |  |  |  | 49,200,000 | 21,100,000 |  |  |  | 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | 8,600,000 |  | 300,000 |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 718,500,000 | 291,400,000 | 74,700,000 | 327,400,000 | 25,000,000
Invested Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |

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