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Significant Accounting Policies and Responsibility for Financial Statements (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Jul. 31, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Jun. 30, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Apr. 30, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Mar. 31, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Jan. 31, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Jun. 30, 2010 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member] | Jun. 30, 2010 Texas-New Mexico Power Company [Member] Affiliated Entity [Member] | Jun. 30, 2011 PNM Resources [Member] | Jun. 30, 2010 PNM Resources [Member]
Dividends Declared per Common Share (dollars per share) | $ 0.125 | $ 0.125 | $ 0.250 | $ 0.250 |  |  |  |  |  |  |  |  |  | $ 0.125 | $ 0.125
Common Stock Dividends Declared |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Payments of Dividends, Common Stock |  |  |  |  | 3.6 |  | 4.6 |  | 39.1 |  |  | 7.1 | 1.6 |  |
Dividends, Common Stock |  |  |  |  |  | $ 3.6 |  | $ 4.6 |  | $ 39.1 |  | $ 7.1 | $ 1.6 |  |

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