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Business Segment Information Business Segment Information (Restructuring Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges     $ 38          
Entergy Wholesale Commodities [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges $ 17 $ 22 38 $ 56        
Restructuring Reserve 167 195 167 195 $ 164 $ 143 $ 227 $ 193
Payments for Restructuring 14 54 14 54        
Asset Write-Offs, Impairments, And Related Charges 7 16 12 90        
Entergy Wholesale Commodities [Member] | Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges 17 22 38 56        
Restructuring Reserve 153 181 153 181 150 129 213 179
Payments for Restructuring 14 54 14 54        
Entergy Wholesale Commodities [Member] | Economic Development Costs [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges 0 0 0 0        
Restructuring Reserve 14 14 14 14 $ 14 $ 14 $ 14 $ 14
Payments for Restructuring $ 0 $ 0 $ 0 $ 0