Regulatory and Rate Matters - PNM (Details) - USD ($) $ in Millions	May 28, 2026	Sep. 30, 2026
Regulated Operations [Abstract]
Excess return on jurisdictional equity that would require refund		0.50%
Annual Revenue Collection	$ 53.0

Public Utilities, Excess Return On Jurisdictional Equity That Would Require Refund

No definition available.

Name:	pnm_PublicUtilitiesExcessReturnOnJurisdictionalEquityThatWouldRequireRefund
Namespace Prefix:	pnm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant