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Commitments and Contingencies - PVNGS Liability and Insurance Matters (Details) - PNM - Palo Verde Nuclear Generating Station - Nuclear plant $ in Millions	Mar. 31, 2024 USD ($)
Public Utilities, Commitments And Contingencies [Line Items]
Maximum potential assessment per incident	$ 36.3
Annual payment limitation related to incident	5.4
Aggregate amount of all risk insurance	2,800.0
Maximum amount under nuclear electric insurance limited	4.9
Maximum
Public Utilities, Commitments And Contingencies [Line Items]
Liability insurance coverage	16,300.0
Liability insurance coverage sublimit	2,250.0
Commercial providers
Public Utilities, Commitments And Contingencies [Line Items]
Liability insurance coverage	500.0
Industry Wide Retrospective Assessment Program
Public Utilities, Commitments And Contingencies [Line Items]
Liability insurance coverage	$ 15,800.0

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