Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,108,000,000		$ 2,108,000,000		$ 1,885,000,000
Average Coupon Rate of Debt Securities Percentage	3.68%		3.68%
Average Duration of Debt Securities in Years			6 years 5 months 15 days
Average Maturity of Debt Securities, Years			10 years 10 months 2 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 173,000,000	$ 226,000,000	$ 504,000,000	$ 486,000,000
Debt Securities, Available-for-Sale, Realized Gain	3,000,000	0	3,000,000	1,000,000
Debt Securities, Available-for-Sale, Realized Loss	5,000,000	11,000,000	26,000,000	28,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	185,000,000		549,000,000
Debt Securities [Member]
Decommissioning Trust Funds (Textual) [Abstract]
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	$ 632,300,000		$ 632,300,000		548,100,000
Average Coupon Rate of Debt Securities Percentage	3.09%		3.09%
Average Duration of Debt Securities in Years			6 years 5 months 12 days
Average Maturity of Debt Securities, Years			8 years 5 months 19 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 4,200,000	1,800,000	$ 22,100,000	18,400,000
Debt Securities, Available-for-Sale, Realized Gain	0	0	100,000	0
Debt Securities, Available-for-Sale, Realized Loss	300,000	100,000	1,200,000	1,800,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	50,700,000		156,300,000
Entergy Louisiana [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 886,000,000		$ 886,000,000		813,900,000
Average Coupon Rate of Debt Securities Percentage	4.16%		4.16%
Average Duration of Debt Securities in Years			6 years 6 months 3 days
Average Maturity of Debt Securities, Years			13 years 1 month 6 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 51,900,000	148,100,000	$ 162,800,000	280,700,000
Percentage Interest in River Bend			30.00%
Debt Securities, Available-for-Sale, Realized Gain	500,000	0	$ 700,000	500,000
Debt Securities, Available-for-Sale, Realized Loss	1,500,000	8,600,000	9,200,000	17,600,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	86,100,000		251,500,000
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 590,100,000		$ 590,100,000		$ 523,200,000
Average Coupon Rate of Debt Securities Percentage	3.56%		3.56%
Average Duration of Debt Securities in Years			6 years 4 months 28 days
Average Maturity of Debt Securities, Years			9 years 9 months 29 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 117,300,000	76,200,000	$ 318,800,000	187,300,000
Debt Securities, Available-for-Sale, Realized Gain	2,200,000	0	2,400,000	0
Debt Securities, Available-for-Sale, Realized Loss	3,300,000	$ 2,700,000	15,200,000	$ 9,100,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 48,300,000		$ 141,600,000