Commitments and Contingencies - Environmental Requirements - Water and Waste (Details) - Federal Coal Ash Regulation $ in Millions	Sep. 30, 2022 USD ($) Plan
Site Contingency [Line Items]
Number of sites where regulated ash units will still be in operation at a specified date	5
Number of sites where corrective action options are being evaluated for locations with statistically significant increases above background concentrations | Plan	2
Estimated cost to remediate groundwater sampling results	$ 35
Maximum [Member]
Site Contingency [Line Items]
Cost of Beneficial Use Coal Ash Project	$ 43