XML 82 R59.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Income Taxes (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 23, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Contingency [Line Items] |  |  |  |  |  |
New Mexico Corporate tax rate before change in 2013 |  |  |  |  |  | 7.60%
New Mexico Corporate tax rate, effective by 2018 |  |  |  |  | 5.90% |
Increase (decrease) in deferred tax assets as a result of tax rate changes |  |  |  | $ (0.7) |  |
Increase (decrease) in tax expense due to tax rate change (less than for 2017) |  |  |  | 0.8 |  |
Corporate and Other |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Increase (decrease) in tax expense due to tax rate change (less than for 2017) |  | $ 0.1 |  | (0.1) |  |
Internal Revenue Service (IRS) |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Net refunds received from the IRS |  |  | $ 6.5 |  |  |
Increase (decrease) in interest receivable |  |  | (2.1) |  |  |
Interest income |  |  | 5.1 |  |  |
Interest expense |  |  | 0.7 |  |  |
Professional fees |  |  | 0.9 |  |  |
Net pre-tax impacts, liability (refund) |  |  | (3.5) |  |  |
Internal Revenue Service (IRS) | Corporate and Other |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Net pre-tax impacts, liability (refund) |  |  | (0.6) |  |  |
Internal Revenue Service (IRS) | PNM |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Net pre-tax impacts, liability (refund) |  |  | (2.6) |  |  |
Internal Revenue Service (IRS) | Texas-New Mexico Power Company |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Net pre-tax impacts, liability (refund) |  |  | $ 0.3 |  |  |
NMPRC |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Period of time for proposed return to customers the benefit of the reduction in New Mexico's corporate income tax rate | 3 years |  |  |  |  |
PNM |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Increase (decrease) in regulatory liability |  | (4.8) |  | $ (7.1) |  |
Increase (decrease) in deferred tax assets as a result of tax rate changes |  | (0.1) |  |  |  |
Increase (decrease) in tax expense due to tax rate change (less than for 2017) |  | $ 0.1 |  |  |  |
PNM | NMPRC |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Period of time for proposed return to customers the benefit of the reduction in New Mexico's corporate income tax rate | 3 years |  |  |  |  |

X
- Definition Increase/Decrease in Income Tax expense due to tax rate change + References No definition available. + Details
Name: | pnm_IncreaseDecreaseinIncomeTaxexpenseduetotaxratechange
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase/Decrease in deferred tax asset not related to regulatory activity, as a result of tax rate changes + References No definition available. + Details
Name: | pnm_IncreaseDecreaseindeferredtaxassetnotrelatedtoregulatoryactivityasaresultoftaxratechanges
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase/Decrease in regulatory liability due to change in state corporate tax rate + References No definition available. + Details
Name: | pnm_IncreaseDecreaseinregulatoryliabilityduetochangeinstatecorporatetaxrate
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition New Mexico Corporate tax rate, 2014 + References No definition available. + Details
Name: | pnm_NewMexicoCorporatetaxrate2014
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition New Mexico Corporate tax rate, effective by 2018 + References No definition available. + Details
Name: | pnm_NewMexicoCorporatetaxrateeffectiveby2018
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Proposed Term to Provide Customers with Benefits Related to Reduction in State Corporate Income Tax Rate + References No definition available. + Details
Name: | pnm_PublicUtilitiesProposedTermtoProvideCustomerswithBenefitsRelatedtoReductioninStateCorporateIncomeTaxRate
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_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) during the reporting period in the aggregate amount due to the entity in the form of unpaid interest and dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInInterestAndDividendsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest expense classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph -4 -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpenseOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
Name: | us-gaap_InterestIncomeOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
Name: | us-gaap_ProceedsFromIncomeTaxRefunds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849 + Details
Name: | us-gaap_ProfessionalFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pnm_PNMSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=pnm_NMPRCMember
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: |