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Commitments and Contingencies - PVNGS Liability and Insurance Matters (Details) - PNM - Palo Verde Nuclear Generating Station - Nuclear plant $ in Millions	Jun. 30, 2024 USD ($)
Public Utilities, Commitments And Contingencies [Line Items]
Maximum retrospective premium per reactor	$ 165.9
Maximum annual premium per incident	24.7
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	5.1
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
Maximum
Public Utilities, Commitments And Contingencies [Line Items]
Liability insurance coverage	16,300.0
Liability insurance coverage sublimit	$ 2,250.0

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