Regulatory and Rate Matters - FERC Compliance (Details) $ in Millions	Jul. 29, 2022 filedPetition	Jul. 18, 2022 denialNotice	Jun. 16, 2022 USD ($) numberOfAMIMeter proceeding	May 17, 2022 delegatedLetterOrder
Public Utilities, General Disclosures [Line Items]
Number of delegated letter orders | delegatedLetterOrder				2
Number of requests for rehearing | numberOfAMIMeter			2
Number of FERC proceedings | proceeding			2
Number of rehearing denial notices | denialNotice		2
Number of petitions filed for review | filedPetition	2
Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Compliance extension period			75 days
Compliance extension period, repost period			30 days
Public Service Company of New Mexico | FERC Proceedings One
Public Utilities, General Disclosures [Line Items]
Time-value customer refund			$ 7.0
Public Service Company of New Mexico | FERC Proceedings Two
Public Utilities, General Disclosures [Line Items]
Time-value customer refund			$ 28.0