Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair value of debt securities by contractual maturities
1 year - 5 years	$ 526,000	$ 473,000
5 years - 10 years	456,000	655,000
10 years - 15 years	111,000	389,000
15 years - 20 years	139,000	130,000
20 years+	317,000	530,000
Total	1,626,000	2,177,000
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	77,000	0
Decommissioning Fund Investments	3,910,411	5,514,016
Entergy Arkansas [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	156,700	91,700
5 years - 10 years	180,100	217,400
10 years - 15 years	34,500	146,000
15 years - 20 years	30,800	35,700
20 years+	18,500	35,500
Total	461,100	526,300
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	40,500	0
Decommissioning Fund Investments	1,141,672	1,438,416
Entergy Louisiana [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	184,700	157,800
5 years - 10 years	152,600	173,000
10 years - 15 years	67,900	123,000
15 years - 20 years	80,500	80,200
20 years+	199,700	260,200
Total	714,700	794,200
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	29,300	0
Decommissioning Fund Investments	1,682,479	2,114,523
System Energy [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	184,400	156,800
5 years - 10 years	123,600	161,800
10 years - 15 years	9,000	58,600
15 years - 20 years	27,600	1,900
20 years+	98,400	145,400
Total	450,700	524,500
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	7,700	0
Decommissioning Fund Investments	$ 1,086,261	$ 1,385,254