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Exit Activities - Narrative (Details) - D.E. Karn Generating Complex
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Expected cost $ 35 $ 35
Retention Benefits    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Retention costs $ 4 7
Property, Plant and Equipment | Retention Benefits    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cost capitalized   $ 1