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Environmental Requirements - Water and Waste (Details)
$ in Millions
Dec. 31, 2023
USD ($)
sites
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