Business Segment Information Business Segment Information (Restructuring Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges			$ 57
Entergy Wholesale Commodities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	$ 19	$ 14	57	$ 70
Restructuring Reserve	185	123	185	123	$ 167	$ 143	$ 195	$ 193
Payments for Restructuring	1	86	15	140
Asset Write-Offs, Impairments, And Related Charges	4	8	16	98
Entergy Wholesale Commodities [Member] | Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	19	14	57	70
Restructuring Reserve	171	109	171	109	153	129	181	179
Payments for Restructuring	1	86	15	140
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