Commitments and Contingencies Environmental Requirements - Water and Waste (Details) $ in Millions	Dec. 31, 2023 USD ($) site sites
Loss Contingencies [Line Items]
Number of sites under investigation as part of federal CCR program | site	4
Accrued liability of sites under investigation as part of federal CCR program	$ 40
Number of sites that will excavate and process ash for beneficial use | sites	2
WYCO, Inc. [Member]
Loss Contingencies [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Federal Coal Ash Regulation [Domain] | Maximum | PSCo [Member]
Loss Contingencies [Line Items]
Cost of Beneficial Use Coal Ash Project	$ 45