Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 28, 2022
Decommissioning Fund Investments	$ 4,121,864	$ 5,514,016
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts	(2,231)	(28,435)	$ 17,586
Amortized cost of debt securities	$ 1,852,000	2,125,000
Average coupon rate of debt securities	3.12%
Proceeds from the dispositions of debt securities	$ 889,000	1,465,000	1,024,000
Average Duration of Debt Securities in Years	6 years 6 months 3 days
Average Maturity of Debt Securities, Years	10 years 9 months 21 days
Debt Securities, Available-for-sale, Allowance for Credit Loss		400
Debt Securities, Available-for-sale, Realized Gain	$ 2,000	29,000	47,000
Debt Securities, Available-for-sale, Realized Loss	46,000	17,000	4,000
Equity Securities, FV-NI, Unrealized Loss	(605,000)
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale	1,500
Entergy Arkansas [Member]
Decommissioning Fund Investments	1,199,860	1,438,416
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 539,800	519,600
Average coupon rate of debt securities	2.40%
Proceeds from the dispositions of debt securities	$ 42,100	57,600	94,500
Average Duration of Debt Securities in Years	6 years 2 months 12 days
Average Maturity of Debt Securities, Years	7 years 8 months 12 days
Debt Securities, Available-for-sale, Realized Gain	$ 100	2,500	8,800
Debt Securities, Available-for-sale, Realized Loss	2,600	600	200
Equity Securities, FV-NI, Unrealized Loss	(181,400)
Entergy Louisiana [Member]
Decommissioning Fund Investments	$ 1,779,090	2,114,523
Percentage Interest in River Bend	30.00%
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 789,100	766,300
Average coupon rate of debt securities	3.79%
Proceeds from the dispositions of debt securities	$ 362,200	303,400	159,700
Average Duration of Debt Securities in Years	6 years 9 months 10 days
Average Maturity of Debt Securities, Years	13 years 14 days
Debt Securities, Available-for-sale, Realized Gain	$ 1,300	6,800	8,100
Debt Securities, Available-for-sale, Realized Loss	23,000	4,100	700
Equity Securities, FV-NI, Unrealized Loss	(253,500)
System Energy [Member]
Decommissioning Fund Investments	1,142,914	1,385,254
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 522,700	515,600
Average coupon rate of debt securities	2.79%
Proceeds from the dispositions of debt securities	$ 209,400	513,800	252,200
Average Duration of Debt Securities in Years	6 years 4 months 20 days
Average Maturity of Debt Securities, Years	10 years 5 months 4 days
Debt Securities, Available-for-sale, Realized Gain	$ 200	9,300	11,500
Debt Securities, Available-for-sale, Realized Loss	10,700	4,000	$ 600
Equity Securities, FV-NI, Unrealized Loss	$ (170,000)
Palisades [Member]
Decommissioning Trust Fair Values		576,000		$ 552,000
Debt Securities [Member]
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts		$ 2,000