XML 138 R107.htm IDEA: XBRL DOCUMENT v3.6.0.2

Commitments and Contingencies - Tax Assessment (Details) - Four Corners [Member] - NMTRD Coal Severance Tax [Member] - USD ($) $ in Millions	Mar. 31, 2016	May 23, 2013
Public Utilities, General Disclosures [Line Items]
Assessed coal severance surtax penalty and interest		$ 30.0
Payment of settlement	$ 0.1

X

- Definition

Public Utilities, Assessed Coal Severance Surtax Penalty and Interest

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesAssessedCoalSeveranceSurtaxPenaltyandInterest
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Public Utilities, Assessed Coal Severance Surtax Penalty and Interest, PNM Share

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesAssessedCoalSeveranceSurtaxPenaltyandInterestPNMShare
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=pnm_FourCornersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=pnm_NMTRDCoalSeveranceTaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: