Commitments and Contingencies - Nuclear Spent Fuel and Waste Disposal (Details) - Public Service Company of New Mexico - Palo Verde Nuclear Generating Station - Nuclear spent fuel and waste disposal - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2019
Loss Contingencies [Line Items]
Estimate of possible loss			$ 59.6
Other deferred credits
Loss Contingencies [Line Items]
Liability for interim storage costs	$ 12.0	$ 13.0