Commitments and Contingencies - PVNG Liability and Insurance Matters (Details) - Public Service Company of New Mexico - Palo Verde Nuclear Generating Station	12 Months Ended
	Dec. 31, 2022 USD ($) generatingUnit	Jan. 31, 2023 USD ($)
Public Utilities, General Disclosures [Line Items]
Number of units (in generating units) | generatingUnit	3
Nuclear Plant
Public Utilities, General Disclosures [Line Items]
Ownership percentage in nuclear reactor	10.20%
Number of units (in generating units) | generatingUnit	3
Maximum potential assessment per incident	$ 42,100,000
Annual payment limitation related to incident	6,200,000
Aggregate amount of all risk insurance	2,800,000,000
Sublimit amount for non-nuclear property damage losses	2,250,000,000
Retrospective premium assessment	5,400,000
Nuclear Plant | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Maximum potential assessment per incident		$ 31,200,000
Annual payment limitation related to incident		4,700,000
Retrospective premium assessment		$ 5,100,000
Nuclear Plant | Commercial Providers
Public Utilities, General Disclosures [Line Items]
Liability insurance coverage	450,000,000
Nuclear Plant | Industry Wide Retrospective Assessment Program
Public Utilities, General Disclosures [Line Items]
Liability insurance coverage	13,200,000,000
Nuclear Plant | Maximum
Public Utilities, General Disclosures [Line Items]
Liability insurance coverage	$ 13,700,000,000