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Regulatory and Rate Matters - Proceeding Regarding Definition of Future Test Year (Details) - 2014 Electric Rate Case [Member] - Public Service Company of New Mexico [Member] | Nov. 30, 2015 | Jul. 31, 2015 | May 27, 2015
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Public Utilities, General Disclosures [Line Items] |  |  |
Defined future test year as period that begins a period of time following the filing of an application to increase rates (no later than) |  |  | 45 days
Belief that the correct interpretation of future test year is period time after filing of an application (up to) |  |  | 13 months
Motion for a temporary stay |  | 30 days |
Redefined future test year as period that begins a period of time following the filing of a rate case application (up to) | 13 months |  |

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- Definition Future test year period, Number of days following the filing of application for rate increase + References No definition available. + Details
Name: | pnm_FuturetestyearperiodNumberofdaysfollowingthefilingofapplicationforrateincrease
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Future test year period, Number of days following the filing of application for rate increase, Alternative interpretation + References No definition available. + Details
Name: | pnm_FuturetestyearperiodNumberofdaysfollowingthefilingofapplicationforrateincreaseAlternativeinterpretation
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Future test year period, Revised, Number of days following the filing of application for rate increase + References No definition available. + Details
Name: | pnm_FuturetestyearperiodRevisedNumberofdaysfollowingthefilingofapplicationforrateincrease
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Requested stay period + References No definition available. + Details
Name: | pnm_Requestedstayperiod
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_A2014ElectricRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |