XML 34 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Segment Information (Narrative and Major Customers) (Details) (Sales [Member]) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
First Choice [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Operating revenues from continuing operations (as a percent) | 17.00% | 19.00% | 17.00%
Unaffiliated Customer of Texas-New Mexico Power Company One [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Operating revenues from continuing operations (as a percent) | 16.00% | 17.00% | 19.00%
Unaffiliated Customer of Texas-New Mexico Power Company Two [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Operating revenues from continuing operations (as a percent) | 10.00% | 10.00% | 12.00%
PNMR and PNM [Member] | Maximum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Operating revenues from continuing operations (as a percent) | 10.00% |  |

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

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration