Decommissioning Trust Funds (Schedule of Realized Gain (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Proceeds from Sale of Debt Securities, Available-for-sale	$ 223,000	$ 173,000	$ 712,000	$ 504,000
Debt Securities, Available-for-Sale, Realized Gain	2,000	3,000	4,000	3,000
Debt Securities, Available-for-Sale, Realized Loss	3,000	5,000	11,000	26,000
System Energy [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	87,300	117,300	394,900	318,800
Debt Securities, Available-for-Sale, Realized Gain	1,200	2,200	2,600	2,400
Debt Securities, Available-for-Sale, Realized Loss	600	3,300	4,600	15,200
Entergy Louisiana [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	120,800	51,900	302,300	162,800
Debt Securities, Available-for-Sale, Realized Gain	1,000	500	1,200	700
Debt Securities, Available-for-Sale, Realized Loss	1,900	1,500	5,900	9,200
Entergy Arkansas [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	15,000	4,200	15,000	22,100
Debt Securities, Available-for-Sale, Realized Gain	100	0	100	100
Debt Securities, Available-for-Sale, Realized Loss	$ 100	$ 300	$ 100	$ 1,200