Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jun. 28, 2022
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts	$ 1,223,000	$ (1,259,000)	$ (2,230,000)	$ (26,867,000)
Amortized cost of debt securities	$ 1,856,000,000		$ 1,856,000,000		$ 2,125,000,000
Average coupon rate of debt securities	2.98%		2.98%
Average duration of debt securities, years			6 years 3 months 21 days
Average maturity of debt securities, years			10 years 4 months 17 days
Proceeds from the dispositions of debt securities	$ 119,000,000	354,000,000	$ 755,000,000	1,151,000,000
Debt Securities, Available-for-sale, Allowance for Credit Loss					400,000
Equity Securities, FV-NI, Unrealized Loss	(120,000,000)		(767,000,000)
Debt Securities, Available-for-sale, Realized Gain	200,000	8,000,000	2,000,000	24,000,000
Debt Securities, Available-for-sale, Realized Loss	8,000,000	2,000,000	36,000,000	15,000,000
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale			1,500,000
Debt Securities [Member]
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts					2,000,000
Entergy Arkansas [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 534,800,000		$ 534,800,000		519,600,000
Average coupon rate of debt securities	2.22%		2.22%
Average duration of debt securities, years			5 years 9 months 21 days
Average maturity of debt securities, years			7 years 1 month 28 days
Proceeds from the dispositions of debt securities	$ 17,200,000	20,600,000	$ 33,100,000	46,700,000
Equity Securities, FV-NI, Unrealized Loss	(35,300,000)		(229,200,000)
Debt Securities, Available-for-sale, Realized Gain		700,000	100,000	2,300,000
Debt Securities, Available-for-sale, Realized Loss	2,000,000	200,000	2,500,000	300,000
Entergy Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 799,500,000		$ 799,500,000		766,300,000
Average coupon rate of debt securities	3.67%		3.67%
Average duration of debt securities, years			6 years 7 months 24 days
Average maturity of debt securities, years			12 years 6 months 25 days
Proceeds from the dispositions of debt securities	$ 47,600,000	20,500,000	$ 288,500,000	191,400,000
Percentage Interest in River Bend			30.00%
Equity Securities, FV-NI, Unrealized Loss	(51,600,000)		$ (322,900,000)
Debt Securities, Available-for-sale, Realized Gain	200,000	900,000	1,300,000	5,600,000
Debt Securities, Available-for-sale, Realized Loss	2,800,000	23,500	15,000,000	3,400,000
System Energy [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 521,800,000		$ 521,800,000		515,600,000
Average coupon rate of debt securities	2.67%		2.67%
Average duration of debt securities, years			6 years 3 months 18 days
Average maturity of debt securities, years			10 years 2 months 19 days
Proceeds from the dispositions of debt securities	$ 54,600,000	292,800,000	$ 158,600,000	468,500,000
Equity Securities, FV-NI, Unrealized Loss	(33,200,000)		(215,000,000)
Debt Securities, Available-for-sale, Realized Gain	20,000.00	5,900,000	200,000	9,000,000
Debt Securities, Available-for-sale, Realized Loss	$ 3,000,000	$ 2,000,000	$ 8,300,000	$ 3,800,000
Palisades [Member]
Decommissioning Trust Funds [Abstract]
Decommissioning Fund Investments, Fair Value					$ 576,000,000	$ 552,000,000