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Commitments and Contingencies Environmental Requirements - Water and Waste (Details) $ in Millions	Mar. 31, 2024 USD ($) sites Period
Site Contingency [Line Items]
Number of sites under investigation as part of federal CCR program | Period	4
Accrued liability of sites under investigation as part of federal CCR program	$ 40
Federal Coal Ash Regulation | PSCo
Site Contingency [Line Items]
Number of sites that will excavate and process ash for beneficial use | sites	2
Federal Coal Ash Regulation | PSCo | Maximum [Member]
Site Contingency [Line Items]
Cost of Beneficial Use Coal Ash Project	$ 45
Federal Clean Water Act Section 316 (b) | Capital Addition Purchase Commitments
Site Contingency [Line Items]
Liability for estimated cost to comply with entrainment regulation	$ 50

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