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Capitalization, Short-term Debt (Details) (USD $) |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 30, 2011 | Dec. 31, 2010 | Oct. 31, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] | Nov. 01, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] Issuance of Debt [Member] | Oct. 31, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member] | Oct. 31, 2011 PNM Resources [Member] Revolving credit facility [Member] Refinancing of Debt [Member] | Oct. 31, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member] Refinancing of Debt [Member] | Oct. 30, 2011 PNM Resources [Member] Revolving credit facility [Member] | Sep. 30, 2011 PNM Resources [Member] Revolving credit facility [Member] | Dec. 31, 2010 PNM Resources [Member] Revolving credit facility [Member] | Sep. 30, 2011 PNM Resources [Member] Local lines of credit [Member] | Dec. 31, 2010 PNM Resources [Member] Local lines of credit [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Oct. 30, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Revolving credit facility [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Revolving credit facility [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] Revolving credit facility [Member] | Sep. 30, 2011 Line of Credit [Member] | Dec. 31, 2010 Line of Credit [Member]
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Related Party Debt |  |  |  |  | $ 63,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt – affiliate |  |  | 63,800,000 | 0 |  | 5,400,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,200,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 300,000,000 | 400,000,000 | 517,000,000 |  |  | 5,000,000 |  |  |  | 368,000,000 |  |  |  |  | 75,000,000 |  |  |
Short-term debt | $ 289,000,000 | $ 222,000,000 |  |  |  |  |  |  |  |  | $ 32,000,000 | $ 32,000,000 | $ 0 | $ 0 | $ 257,000,000 | $ 190,000,000 |  | $ 257,000,000 | $ 190,000,000 |  |  | $ 0 | $ 0 | $ 289,000,000 | $ 222,000,000

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- Definition The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 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 19 -Subparagraph b -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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