Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Less than 1 year	$ 82.0	$ 62.0
1 year - 5 years	517.0	520.0
5 years - 10 years	504.0	461.0
10 years - 15 years	121.0	117.0
15 years - 20 years	179.0	161.0
20 years+	367.0	334.0
Total	1,770.0	1,655.0
Entergy Arkansas [Member]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Less than 1 year	45.3	21.2
1 year - 5 years	132.2	159.7
5 years - 10 years	205.7	191.7
10 years - 15 years	39.9	38.0
15 years - 20 years	49.6	42.6
20 years+	24.2	17.5
Total	496.9	470.7
Entergy Louisiana [Member]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Less than 1 year	31.4	33.6
1 year - 5 years	181.6	159.1
5 years - 10 years	170.0	161.7
10 years - 15 years	70.2	67.1
15 years - 20 years	90.2	83.3
20 years+	244.7	220.3
Total	788.1	725.1
System Energy [Member]
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Less than 1 year	5.3	6.8
1 year - 5 years	203.4	201.7
5 years - 10 years	128.6	107.1
10 years - 15 years	10.7	11.7
15 years - 20 years	38.8	35.0
20 years+	98.4	97.4
Total	$ 485.2	$ 459.7