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Asset Sale and Exit Activities - Narrative (Details) - Retention Benefits - D.E. Karn Generating Complex
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Expected cost $ 35 $ 35 $ 35
Retention costs $ 4 11 14
Costs incurred and capitalized   $ 1  
Property, Plant and Equipment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Costs incurred and capitalized     $ 2