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Rate And Regulatory Matters (Narrative-Missouri) (Details) - Union Electric Company
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
MWh
Mar. 31, 2022
MWh
Jun. 30, 2022
USD ($)
numberOfCountriesInvestigatedByTheDOC
Rate And Regulatory Matters [Line Items]      
Missouri Renewable Energy Standard Percentage     15.00%
Missouri Renewable Energy Standard Percentage - Solar     2.00%
Number of Countries Investigated by the DOC | numberOfCountriesInvestigatedByTheDOC     4
Pending Rate Case | Electric      
Rate And Regulatory Matters [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 316
Public Utilities, Requested Return on Equity, Percentage     10.20%
Public Utilities, Requested Equity Capital Structure, Percentage     51.90%
Rate Base     $ 11,600
Months to complete a rate proceeding     11 months
Wind Generation Facility      
Rate And Regulatory Matters [Line Items]      
Amount of Megawatts | MWh 200 150  
Maximum      
Rate And Regulatory Matters [Line Items]      
PISA Rate Increase Limit Beginning 2024     2.50%
Public Utilities, Approved Rate Increase (Decrease), Percentage     2.85%
Percentage of energy sourced from renewable resources     100.00%