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Commitments and Contingencies Environmental Requirements - Water and Waste (Details) $ in Millions	Sep. 30, 2022 USD ($) Period
Federal Coal Ash Regulation
Site Contingency [Line Items]
Number of sites where regulated ash units will still be in operation at a specified date | Period	8
Federal Coal Ash Regulation | PSCo
Site Contingency [Line Items]
Estimated cost to remediate groundwater sampling results	$ 35
Federal Coal Ash Regulation | PSCo | Maximum [Member]
Site Contingency [Line Items]
Cost of Beneficial Use Coal Ash Project	43
Federal Clean Water Act Section 316 (b) | Capital Addition Purchase Commitments
Site Contingency [Line Items]
Liability for estimated cost to comply with regulation	$ 40

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Cost of Beneficial Use Coal Ash Project

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Estimated cost to remediate groundwater sampling results

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Estimated undiscounted amount of the accrual required to comply with required regulation.

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Number of sites where regulated ash units will still be in operation at a specified date

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