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Significant Accounting Policies and Responsibility for Financial Statements (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 3 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 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] | Sep. 30, 2010 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member] | Sep. 30, 2010 Texas-New Mexico Power Company [Member] Affiliated Entity [Member] | Sep. 30, 2011 PNM Resources [Member] | Jun. 30, 2011 PNM Resources [Member] | Sep. 30, 2010 PNM Resources [Member] | Jun. 30, 2010 PNM Resources [Member]
Dividends Declared per Common Share (dollars per share) | $ 0.125 | $ 0.125 | $ 0.375 | $ 0.375 |  |  |  |  |  |  |  |  |  | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125
Payments of Dividends, Common Stock |  |  |  |  | $ 3.6 |  | $ 4.6 |  | $ 39.1 |  |  | $ 7.1 | $ 5.8 |  |  |  |
Dividends, Common Stock |  |  |  |  |  | 3.6 |  | 4.6 |  | 39.1 |  | 7.1 | 5.8 |  |  |  |
Common Stock Dividends Declared |  |  |  |  |  |  |  |  |  |  | $ 28.0 |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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- Definition Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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