XML 162 R129.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Commitments and Contingencies - Santa Fe Generating Station (Narrative) (Details) |  | 1 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 numberOfAMIMeter | Jul. 31, 2020 numberOfAMIMeter | Dec. 31, 2014 monitoringWell
Commitments and Contingencies Disclosure [Abstract] |  |  |
Number of monitoring wells containing free-phase hydrocarbon products | monitoringWell |  |  | 1
Number of field work reports | numberOfAMIMeter | 2 | 2 |

X
- Definition Number Of Field Work Reports + References No definition available. + Details
Name: | pnm_NumberOfFieldWorkReports
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Monitoring Wells Containing Free-Phase Hydrocarbon Products + References No definition available. + Details
Name: | pnm_NumberOfMonitoringWellsContainingFreePhaseHydrocarbonProducts
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration