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Business Segment Information Business Segment Information (Restructuring Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges     $ 9          
Entergy Wholesale Commodities [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges $ 2 $ 19 10 $ 57        
Restructuring Reserve 35 185 35 185 $ 33 $ 159 $ 167 $ 143
Payments for Restructuring 0 1 134 15        
Asset Write-Offs, Impairments, And Related Charges   4 345 16        
Entergy Wholesale Commodities [Member] | Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges 2 19 9 57        
Restructuring Reserve 35 171 35 171 33 145 153 129
Payments for Restructuring 0 1 119 15        
Entergy Wholesale Commodities [Member] | Economic Development Costs [Member]                
Segment Reporting Information [Line Items]                
Restructuring Charges 0 0 1 0        
Restructuring Reserve 0 14 0 14 $ 0 $ 14 $ 14 $ 14
Payments for Restructuring $ 0 $ 0 $ 15 $ 0