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Lease Commitments - Finance Lease Balance Sheet Information (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Financing leases: |
Non-utility property | $ 10,028
Accumulated depreciation | (973)
Non-utility property, net | 9,055
Other current liabilities | 1,637
Other deferred credits | 7,102
Public Service Company of New Mexico |
Financing leases: |
Non-utility property | 4,857
Accumulated depreciation | (482)
Non-utility property, net | 4,375
Other current liabilities | 722
Other deferred credits | 3,333
Texas-New Mexico Power Company |
Financing leases: |
Non-utility property | 4,910
Accumulated depreciation | (466)
Non-utility property, net | 4,444
Other current liabilities | 850
Other deferred credits | $ 3,597

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- Definition Finance Lease, Assets and Liabilities, Lessee [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Finance Lease, Liability, Current, Other + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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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
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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
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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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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |