Business Segment Information Business Segment Information (Restructuring Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Payments for Restructuring	$ 54	$ 0	$ 54	$ 0
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges			56
Payments for Restructuring	54	0	54	0
Economic Development Costs [Member]
Segment Reporting Information [Line Items]
Payments for Restructuring	0	0	0	0
Entergy Wholesale Commodities [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	22	34	56	60
Restructuring Reserve	195	157	195	157	$ 227	$ 193	$ 123	$ 97
Entergy Wholesale Commodities [Member] | Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Segment Reporting Information [Line Items]
Restructuring Charges	22	34	56	60
Restructuring Reserve	181	143	181	143	213	179	109	83
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