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v3.19.1

Lease Commitments - Finance Lease Balance Sheet Information (Details) $ in Thousands | Mar. 31, 2019 USD ($)
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Financing leases: |
Non-utility property | $ 2,904
Accumulated depreciation | (78)
Non-utility property, net | 2,826
Other current liabilities | 450
Other deferred credits | 2,089
PNM |
Financing leases: |
Non-utility property | 1,635
Accumulated depreciation | (37)
Non-utility property, net | 1,598
Other current liabilities | 233
Other deferred credits | 1,083
TNMP |
Financing leases: |
Non-utility property | 1,268
Accumulated depreciation | (40)
Non-utility property, net | 1,228
Other current liabilities | 217
Other deferred credits | $ 1,006

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- Definition Finance Lease, Assets and Liabilities, Lessee [Abstract] + References No definition available. + Details
Name: | pnm_FinanceLeaseAssetsandLiabilitiesLesseeAbstract
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Finance Lease, Liability, Current, Other + References No definition available. + Details
Name: | pnm_FinanceLeaseLiabilityCurrentOther
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Finance Lease, Liability, Deferred Credits, Other + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Finance Lease, Right-Of-Use Asset, Accumulated Depreciation + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Finance Lease, Right-Of-Use Asset, Gross + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |