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Environmental Requirements - Water and Waste (Details) $ in Millions | Dec. 31, 2023 USD ($) sites
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Loss Contingencies [Line Items] |
Number of sites under investigation as part of federal CCR program | 4
Accrued liability of sites under investigation as part of federal CCR program | $ 40
Federal Coal Ash Regulation [Member] | PSCo |
Loss Contingencies [Line Items] |
Number of sites that will excavate and process ash for beneficial use | sites | 2
Federal Coal Ash Regulation [Member] | PSCo | Maximum |
Loss Contingencies [Line Items] |
Cost of Beneficial Use Coal Ash Project | $ 45
Federal Clean Water Act Section 316 (b) | Capital Addition Purchase Commitments [Member] |
Loss Contingencies [Line Items] |
Liability for estimated cost to comply with regulation | $ 50

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