Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair value of debt securities by contractual maturities
1 year - 5 years	$ 499,000	$ 520,000
5 years - 10 years	477,000	461,000
10 years - 15 years	108,000	117,000
15 years - 20 years	155,000	161,000
20 years+	341,000	334,000
Total	1,660,000	1,655,000
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	80,000	62,000
Decommissioning Fund Investments	4,417,704	4,121,864
Entergy Arkansas [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	135,800	159,700
5 years - 10 years	189,800	191,700
10 years - 15 years	38,900	38,000
15 years - 20 years	42,200	42,600
20 years+	18,600	17,500
Total	470,900	470,700
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	45,600	21,200
Decommissioning Fund Investments	1,285,583	1,199,860
Entergy Louisiana [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	164,600	159,100
5 years - 10 years	169,200	161,700
10 years - 15 years	64,200	67,100
15 years - 20 years	79,400	83,300
20 years+	227,500	220,300
Total	736,800	725,100
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	31,900	33,600
Decommissioning Fund Investments	1,912,924	1,779,090
System Energy [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	198,900	201,700
5 years - 10 years	118,400	107,100
10 years - 15 years	4,700	11,700
15 years - 20 years	33,100	35,000
20 years+	95,000	97,400
Total	452,800	459,700
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	2,700	6,800
Decommissioning Fund Investments	$ 1,219,196	$ 1,142,914