Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts	$ 7,221	$ 25,581
Amortized cost of debt securities	$ 2,153,000		$ 2,125,000
Average coupon rate of debt securities	2.77%
Average duration of debt securities, years	6 years 7 months 17 days
Average maturity of debt securities, years	10 years 4 months 24 days
Proceeds from the dispositions of debt securities	$ 303,000	524,000
Debt Securities, Available-for-sale, Allowance for Credit Loss	3,200		400
Equity Securities, FV-NI, Unrealized Loss	(175,000)
Debt Securities, Available-for-sale, Realized Gain	1,000	11,000
Debt Securities, Available-for-sale, Realized Loss	12,000	11,000
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	(5,000)		2,000
Entergy Arkansas [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 536,200		519,600
Average coupon rate of debt securities	2.28%
Average duration of debt securities, years	6 years 5 months 26 days
Average maturity of debt securities, years	7 years 8 months 26 days
Proceeds from the dispositions of debt securities	$ 7,200	13,800
Equity Securities, FV-NI, Unrealized Loss	(50,500)
Debt Securities, Available-for-sale, Realized Gain	30	800
Debt Securities, Available-for-sale, Realized Loss	200	100
Entergy Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 767,900		766,300
Average coupon rate of debt securities	3.37%
Average duration of debt securities, years	6 years 4 months 9 days
Average maturity of debt securities, years	12 years 1 month 28 days
Proceeds from the dispositions of debt securities	$ 120,500	108,400
Percentage Interest in River Bend	30.00%
Equity Securities, FV-NI, Unrealized Loss	$ (70,000)
Debt Securities, Available-for-sale, Realized Gain	900	3,300
Debt Securities, Available-for-sale, Realized Loss	5,500	3,200
System Energy [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 525,300		515,600
Average coupon rate of debt securities	2.38%
Average duration of debt securities, years	6 years 11 months 19 days
Average maturity of debt securities, years	9 years 10 months 13 days
Proceeds from the dispositions of debt securities	$ 36,200	74,100
Equity Securities, FV-NI, Unrealized Loss	(47,700)
Debt Securities, Available-for-sale, Realized Gain	100	1,200
Debt Securities, Available-for-sale, Realized Loss	700	$ 1,600
Palisades [Member]
Decommissioning Trust Funds [Abstract]
Decommissioning Fund Investments, Fair Value	$ 539,000		$ 576,000