XML 131 R106.htm IDEA: XBRL DOCUMENT v3.10.0.1

Regulatory and Rate Matters - Proceeding Regarding Definition of Future Test Year (Details)	Dec. 07, 2016
2014 Electric Rate Case | Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Redefined future test year as period that begins a period of time following the filing of a rate case application (up to)	13 months

X

- 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

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:	pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_A2014ElectricRateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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