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Commitments and Contingencies - Water Supply (Details) - Public Service Company of New Mexico [Member] - Palo Verde Nuclear Generating Station [Member]	1 Months Ended
	Apr. 30, 2010 city
Public Utilities, General Disclosures [Line Items]
Providing water to a number of cities	5
Providing water, term	40 years

X

- Definition

Public Utilities, Provide Water for Period of Time

+ References

No definition available.

+ Details

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X

- Definition

Public Utilities, Provide Water to Number of Cities

+ References

No definition available.

+ Details

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X

- 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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X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=pnm_PaloVerdeNuclearGeneratingStationMember
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