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Commitments and Contingencies - Arbitration (Details) - SJCC Arbitration [Member] - San Juan Generating Station [Member] $ in Millions	May 31, 2014 USD ($)
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

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+ Details

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- Definition

Public Utilities, PNM Share of arbitration ruling

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- Definition

Public Utilities, Potential Capital Improvements billed as Mining Costs to SJGS Owners

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- Definition

Public Utilities, Potential Overbilled Mining Costs SJCC Owes to SJGS Owners

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- Definition

Public Utilities, Potential Unbilled Mining Costs Owed to SJCC

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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.

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- Details

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- Details

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