Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,173,000,000		$ 2,173,000,000		$ 2,121,000,000
Average Coupon Rate of Debt Securities Percentage	4.16%		4.16%
Average Duration of Debt Securities in Years			6 years 4 months 9 days
Average Maturity of Debt Securities, Years			10 years 7 months 24 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 223,000,000	$ 173,000,000	$ 712,000,000	$ 504,000,000
Debt Securities, Available-for-Sale, Realized Gain	2,000,000	3,000,000	4,000,000	3,000,000
Debt Securities, Available-for-Sale, Realized Loss	3,000,000	5,000,000	11,000,000	26,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	277,000,000		435,000,000
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	0		0		0
Entergy Arkansas [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 615,800,000		$ 615,800,000		603,500,000
Average Coupon Rate of Debt Securities Percentage	3.85%		3.85%
Average Duration of Debt Securities in Years			6 years 4 months 20 days
Average Maturity of Debt Securities, Years			8 years 8 months 12 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 15,000,000.0	4,200,000	$ 15,000,000.0	22,100,000
Debt Securities, Available-for-Sale, Realized Gain	100,000	0	100,000	100,000
Debt Securities, Available-for-Sale, Realized Loss	100,000	300,000	100,000	1,200,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	79,900,000		123,600,000
Entergy Louisiana [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 954,800,000		$ 954,800,000		931,500,000
Average Coupon Rate of Debt Securities Percentage	4.40%		4.40%
Average Duration of Debt Securities in Years			6 years 3 months 29 days
Average Maturity of Debt Securities, Years			12 years 3 months 18 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 120,800,000	51,900,000	$ 302,300,000	162,800,000
Percentage Interest in River Bend			30.00%
Debt Securities, Available-for-Sale, Realized Gain	1,000,000.0	500,000	$ 1,200,000	700,000
Debt Securities, Available-for-Sale, Realized Loss	1,900,000	1,500,000	5,900,000	9,200,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	120,700,000		192,900,000
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 602,800,000		$ 602,800,000		$ 585,500,000
Average Coupon Rate of Debt Securities Percentage	4.11%		4.11%
Average Duration of Debt Securities in Years			6 years 4 months 17 days
Average Maturity of Debt Securities, Years			10 years 3 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 87,300,000	117,300,000	$ 394,900,000	318,800,000
Debt Securities, Available-for-Sale, Realized Gain	1,200,000	2,200,000	2,600,000	2,400,000
Debt Securities, Available-for-Sale, Realized Loss	600,000	$ 3,300,000	4,600,000	$ 15,200,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 76,400,000		$ 118,800,000