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Acquisitions and Dispositions (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Sep. 23, 2011 First Choice [Member] | Dec. 31, 2011 First Choice [Member] | Dec. 31, 2011 First Choice [Member] | Oct. 31, 2011 First Choice [Member] | Dec. 31, 2009 PNM Gas [Member] | Dec. 31, 2009 Public Service Company of New Mexico [Member] | Jan. 30, 2009 Public Service Company of New Mexico [Member] PNM Gas [Member] | Jul. 31, 2008 Public Service Company of New Mexico [Member] PNM Gas [Member] | Jan. 31, 2008 Public Service Company of New Mexico [Member] PNM Gas [Member] | Dec. 31, 2009 Public Service Company of New Mexico [Member] PNM Gas [Member] | Dec. 31, 2009 PNMR [Member] PNM Gas [Member] | Jun. 30, 2007 Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member] mw | Dec. 31, 2008 Palo Verde Nuclear Generating Station [Member] Public Service Company of New Mexico [Member]
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of business segment subject to adjustments of certain componets of working capital |  |  |  | $ 270,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount received including estimate of components of working capital |  |  |  | 329,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business segment | 174,925,000 | 0 | 0 |  | 174,900,000 | 174,900,000 |  |  |  |  |  |  |  |  |  |
Working capital that purchaser disputing is overstated |  |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  |
Working capital that parent is disputing is understated |  |  |  |  |  |  | (6,500,000) |  |  |  |  |  |  |  |  |
Cash from sale of PNM Gas segment |  |  |  |  |  |  |  |  |  |  |  | 620,000,000 |  |  |  |
Gain on contract termination |  |  |  |  |  |  |  | 292,000 |  |  |  |  |  | 15,000,000 |  |
Gain on sale of PNM Gas segment |  |  |  |  |  |  |  | 98,425,000 |  | 65,300,000 |  |  |  |  |  |
Income taxes on sale of PNM Gas segment |  |  |  |  |  |  |  |  |  | 33,100,000 |  |  |  |  |  |
Amount received related to working capital true-ups |  |  |  |  |  |  |  |  |  | 32,900,000 |  |  |  |  |  |
Disposal Group Cash Received from Contract Termination |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
After-tax gain on termination of CRHC agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,100,000 |  |
After-tax charge to AOCI for retirement programs transferred to NMGC |  |  |  |  |  |  |  |  |  |  |  |  | 64,800,000 |  |  |
PNM expense related to contingent liabilities |  |  |  |  |  |  |  |  | 5,400,000 |  |  |  | 5,400,000 |  |  |
Dividend payment to PNMR |  |  |  |  |  |  |  |  |  |  |  |  | 220,000,000 |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |
Ownership percentage of PNMR's subsidiary in purchased trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Undivided interest in PVNGS Unit 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.27% |
Mega Watts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.8 |
Purchase price, cash paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,100,000
Liabilities incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000

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