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Dispositions Dispositions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Jun. 30, 2019
Jan. 31, 2019
Business Acquisition [Line Items]      
Amount Drawn/ Outstanding   $ 150.0  
Discontinued Operation, Tax Effect of Discontinued Operation $ 29.0    
Restructuring Costs and Asset Impairment Charges 5.4    
After-Tax Asset Impairment Charge $ 4.2    
Entergy Nuclear Vermont Yankee [Member]      
Business Acquisition [Line Items]      
Percentage of Undivided Ownership Interest     100.00%
Amount Drawn/ Outstanding   $ 139.0 $ 139.0