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Discontinued Operations and Dispositions - Discontinued Operations (Details)
$ in Billions
Mar. 31, 2019
MW
Feb. 04, 2019
USD ($)
Dec. 31, 2018
MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Generation capacity (in MW) 23,000    
South Central Portfolio | Discontinued Operations, Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash consideration | $   $ 1  
Generation capacity (in MW)     1,153