XML 67 R51.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Optim Energy (Details) (Optim Energy [Member]) | Jan. 04, 2012 | Sep. 23, 2011 | Sep. 22, 2011
--- | --- | --- | ---
Optim Energy [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage (as a percent) |  |  | 50.00%
Cost method investment, ownership percentage (as a percent) |  | 1.00% |
Cost method investment, ownership percentage, sold (as a percent) | 1.00% |  |

X
- Definition Cost Method Investment, Ownership Percentage + References No definition available. + Details
Name: | pnm_CostMethodInvestmentOwnershipPercentage
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cost Method Investment, Ownership Percentage, Sold + References No definition available. + Details
Name: | pnm_CostMethodInvestmentOwnershipPercentageSold
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration