Decommissioning Trust Funds (Schedule of Realized Gain (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Proceeds from Sale of Debt Securities, Available-for-sale	$ 227,000	$ 161,000	$ 489,000	$ 330,000
Debt Securities, Available-for-Sale, Realized Gain	1,000	0	2,000	1,000
Debt Securities, Available-for-Sale, Realized Loss	4,000	14,000	8,000	20,000
System Energy [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	155,300	93,500	307,600	201,500
Debt Securities, Available-for-Sale, Realized Gain	800	0	1,300	200
Debt Securities, Available-for-Sale, Realized Loss	1,400	8,400	4,000	11,900
Entergy Louisiana [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	71,500	62,500	181,500	110,900
Debt Securities, Available-for-Sale, Realized Gain	100	100	200	200
Debt Securities, Available-for-Sale, Realized Loss	2,400	4,800	4,000	7,700
Entergy Arkansas [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	0	5,500	0	17,900
Debt Securities, Available-for-Sale, Realized Gain	0	100	0	100
Debt Securities, Available-for-Sale, Realized Loss	$ 0	$ 400	$ 0	$ 900