XML 69 R83.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Income Taxes Carryforwards (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2012 Internal Revenue Service (IRS) [Member] | Mar. 31, 2013 Subsequent Event [Member]
--- | --- | --- | --- | ---
Operating Loss Carryforwards [Line Items] |  |  |  |
Federal Net Operating Loss Carryforwards to Expire in 2030 |  |  | $ 223.6 |
Federal Tax Credit Carryforwards that Expire Beginning in 2023 |  |  | 25.2 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease | $ 0.7 | $ 2.6 |  | $ 1.5

X
- Definition Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease + References No definition available. + Details
Name: | pnm_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalDecrease
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Federal Tax Credit Carryforwards that Expire Beginning in 2023 + References No definition available. + Details
Name: | pnm_FederalTaxCreditCarryforwardsThatExpireBeginningIn2023
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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