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Financing Short-term Debt (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2011 | Dec. 31, 2012 Extensions | Dec. 31, 2011 | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Oct. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] | Apr. 30, 2009 Texas-New Mexico Power Company [Member] | Dec. 31, 2012 PNMR Term Loan Agreement [Member] | Feb. 22, 2013 Subsequent Event [Member] | Feb. 22, 2013 Subsequent Event [Member] Public Service Company of New Mexico [Member] | Feb. 22, 2013 Subsequent Event [Member] Texas-New Mexico Power Company [Member] | Feb. 22, 2013 Available Borrowing Capacity [Member]
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 300,000,000 |  |  |  |  | $ 400,000,000 |  |  | $ 75,000,000 |  |  |  |  |
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 |  | 1.96% |  | 1.71% |  |  |  |  |  | 1.335% |  |  |  |
Line of Credit Facility, Amount Outstanding |  | 37,600,000 | 16,700,000 | 21,100,000 | 66,000,000 |  | 0 | 0 |  |  |  |  |  |
Line Of Credit Facility Amount Outstanding, Local Institutions |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  | 158,700,000 | 82,700,000 | 21,100,000 | 66,000,000 |  |  |  |  | 100,000,000 |  |  |  |
Letters of Credit Outstanding, Amount |  | 11,300,000 |  | 3,500,000 |  |  | 300,000 |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | 264,500,000 | 288,800,000 | 49,700,000 | 603,000,000
Invested Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 |  |  |

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