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Commitments and Contingencies - Arbitration (Details) - SJCC Arbitration [Member] - San Juan Generating Station [Member] $ in Millions | May 31, 2014 USD ($)
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Loss Contingencies [Line Items] |
Potential unbilled mining costs owed to SJCC | $ 5.2
Potential overbilled mining costs SJCC owes to SJGS owners | 1.1
Potential capital improvements billed as mining costs to SJGS owners | $ 13.9
Public Service Company of New Mexico [Member] |
Loss Contingencies [Line Items] |
PNM's share of arbitration ruling | 46.30%
FFPAC percentage of mining costs overbilled or unbilled ruled by arbitration | 33.00%

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- Definition Public Utilities, Percentage of PNM Share of mining costs overbilled or unbilled, as ruled by arbitration, that will pass through FFPAC + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Public Utilities, PNM Share of arbitration ruling + References No definition available. + Details
Name: | pnm_PublicUtilitiesPNMShareofarbitrationruling
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Public Utilities, Potential Capital Improvements billed as Mining Costs to SJGS Owners + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Public Utilities, Potential Overbilled Mining Costs SJCC Owes to SJGS Owners + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Public Utilities, Potential Unbilled Mining Costs Owed to SJCC + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pnm_JointlyOwnedGeneratingFacilitiesAxis=pnm_SanJuanGeneratingStationMember
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: |