Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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	$ 3,768	$ (27)	$ (3,453)	$ (25,608)
Amortized cost of debt securities	$ 1,846,000		$ 1,846,000		$ 2,125,000
Average coupon rate of debt securities	2.86%		2.86%
Average duration of debt securities, years			6 years 6 months 25 days
Average maturity of debt securities, years			10 years 2 months 4 days
Proceeds from the dispositions of debt securities	$ 333,000	273,000	$ 636,000	797,000
Debt Securities, Available-for-sale, Allowance for Credit Loss					400
Equity Securities, FV-NI, Unrealized Loss	(481,000)		(647,000)
Debt Securities, Available-for-sale, Realized Gain	1,000	6,000	2,000	17,000
Debt Securities, Available-for-sale, Realized Loss	16,000	1,000	28,000	12,000
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale			1,500
Debt Securities [Member]
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts			(1,000)		2,000
Entergy Arkansas [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 536,800		$ 536,800		519,600
Average coupon rate of debt securities	2.27%		2.27%
Average duration of debt securities, years			6 years 2 months 19 days
Average maturity of debt securities, years			7 years 6 months 10 days
Proceeds from the dispositions of debt securities	$ 8,800	12,300	$ 15,900	26,100
Equity Securities, FV-NI, Unrealized Loss	(143,500)		(193,900)
Debt Securities, Available-for-sale, Realized Gain	30	700	60	1,600
Debt Securities, Available-for-sale, Realized Loss	300	100	500	100
Entergy Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 786,100		$ 786,100		766,300
Average coupon rate of debt securities	3.50%		3.50%
Average duration of debt securities, years			6 years 9 months 10 days
Average maturity of debt securities, years			12 years 4 months 2 days
Proceeds from the dispositions of debt securities	$ 120,300	62,500	$ 240,900	170,900
Percentage Interest in River Bend			30.00%
Equity Securities, FV-NI, Unrealized Loss	(202,900)		$ (271,600)
Debt Securities, Available-for-sale, Realized Gain	200	1,500	1,100	4,800
Debt Securities, Available-for-sale, Realized Loss	6,700	100	12,200	3,300
System Energy [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 523,200		$ 523,200		515,600
Average coupon rate of debt securities	2.46%		2.46%
Average duration of debt securities, years			6 years 7 months 9 days
Average maturity of debt securities, years			9 years 6 months 3 days
Proceeds from the dispositions of debt securities	$ 67,800	101,600	$ 104,000	175,700
Equity Securities, FV-NI, Unrealized Loss	(134,600)		(181,800)
Debt Securities, Available-for-sale, Realized Gain	100	1,900	200	3,100
Debt Securities, Available-for-sale, Realized Loss	$ 4,600	$ 200	$ 5,300	$ 1,800
Palisades [Member]
Decommissioning Trust Funds [Abstract]
Decommissioning Fund Investments, Fair Value					$ 576,000	$ 552,000