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Regulatory and Rate Matters - New Mexico General Rate Cases (Details) $ in Millions			12 Months Ended
	Jan. 03, 2023 USD ($)	Dec. 05, 2022 USD ($) MW	Dec. 31, 2022 lease MW
NMPRC
Public Utilities, General Disclosures [Line Items]
Requested return on equity		10.25%
Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage			52.00%
Public Utilities, Approved Debt Capital Structure, Percentage			48.00%
Leases renewed | lease			5
Number of megawatts purchased (in megawatts) | MW			64.1
Public Service Company of New Mexico | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Non-recurring costs	$ 98.3
Public Service Company of New Mexico | NM 2022 Rate Case
Public Utilities, General Disclosures [Line Items]
Recovery of base rate		$ 2,700.0
Revenue deficiency driver, years of operation		6 years
Leased PVNGS capacity, expiration (in megawatts) | MW		114
Hearing, request suspension period		9 months
Public Service Company of New Mexico | NM 2022 Rate Case | Non-Fuel Energy
Public Utilities, General Disclosures [Line Items]
Requested rate increase		$ 63.8

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