Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair value of debt securities by contractual maturities
1 year - 5 years	$ 556,000	$ 473,000
5 years - 10 years	501,000	655,000
10 years - 15 years	120,000	389,000
15 years - 20 years	143,000	130,000
20 years+	307,000	530,000
Total	1,692,000	2,177,000
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	65,000	0
Decommissioning Fund Investments	4,090,109	5,514,016
Entergy Arkansas [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	157,900	91,700
5 years - 10 years	201,400	217,400
10 years - 15 years	43,000	146,000
15 years - 20 years	34,300	35,700
20 years+	18,100	35,500
Total	484,800	526,300
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	30,100	0
Decommissioning Fund Investments	1,194,815	1,438,416
Entergy Louisiana [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	198,900	157,800
5 years - 10 years	156,600	173,000
10 years - 15 years	70,300	123,000
15 years - 20 years	78,500	80,200
20 years+	203,800	260,200
Total	733,300	794,200
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	25,200	0
Decommissioning Fund Investments	1,756,483	2,114,523
System Energy [Member]
Fair value of debt securities by contractual maturities
1 year - 5 years	199,200	156,800
5 years - 10 years	142,500	161,800
10 years - 15 years	7,200	58,600
15 years - 20 years	29,800	1,900
20 years+	85,700	145,400
Total	474,300	524,500
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	9,900	0
Decommissioning Fund Investments	$ 1,138,811	$ 1,385,254