XML 176 R143.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Regulatory and Rate Matters - Grid Modernization Plan (Narrative) (Details) - PNM $ in Millions | Oct. 03, 2022 USD ($)
--- | ---
Public Utilities, General Disclosures [Line Items] |
Grid modernization investment | $ 344
Grid modernization, initial term | 6 years
Grid modernization term | 11 years

X
- Definition Public Utilities, Grid Modernization, Initial Term + References No definition available. + Details
Name: | pnm_PublicUtilitiesGridModernizationInitialTerm
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Grid Modernization Investment + References No definition available. + Details
Name: | pnm_PublicUtilitiesGridModernizationInvestment
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Grid Modernization Term + References No definition available. + Details
Name: | pnm_PublicUtilitiesGridModernizationTerm
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: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |