XML 138 R82.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Income Taxes Carryforwards (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 Internal Revenue Service (IRS) [Member] | Mar. 31, 2014 Subsequent Event [Member]
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Federal Net Operating Loss Carryforwards to Expire in 2030 | $ 301.2 |
Federal Tax Credit Carryforwards that Expire Beginning in 2023 | 40.6 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease |  | $ 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 Amount of operating loss carryforward, 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 + 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