Regulatory and Rate Matters - Grid Modernization Application (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

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.

No definition available.

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration