Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,051,000,000		$ 2,051,000,000		$ 1,885,000,000
Average Coupon Rate of Debt Securities Percentage	3.63%		3.63%
Average Duration of Debt Securities in Years			6 years 1 month 20 days
Average Maturity of Debt Securities, Years			10 years 5 months 8 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 161,000,000	$ 136,000,000	$ 330,000,000	$ 260,000,000
Debt Securities, Available-for-Sale, Realized Gain	0	0	1,000,000	1,000,000
Debt Securities, Available-for-Sale, Realized Loss	14,000,000	8,000,000	20,000,000	17,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	78,000,000		366,000,000
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	$ 611,500,000		$ 611,500,000		548,100,000
Average Coupon Rate of Debt Securities Percentage	2.92%		2.92%
Average Duration of Debt Securities in Years			5 years 9 months 18 days
Average Maturity of Debt Securities, Years			7 years 6 months 3 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 5,500,000	900,000	$ 17,900,000	16,600,000
Debt Securities, Available-for-Sale, Realized Gain	100,000	0	100,000	0
Debt Securities, Available-for-Sale, Realized Loss	400,000	100,000	900,000	1,700,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	21,700,000		105,700,000
Entergy Louisiana [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 847,800,000		$ 847,800,000		813,900,000
Average Coupon Rate of Debt Securities Percentage	4.03%		4.03%
Average Duration of Debt Securities in Years			6 years 4 months 9 days
Average Maturity of Debt Securities, Years			12 years 9 months 14 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 62,500,000	65,200,000	$ 110,900,000	132,600,000
Percentage Interest in River Bend			30.00%
Debt Securities, Available-for-Sale, Realized Gain	100,000	100,000	$ 200,000	500,000
Debt Securities, Available-for-Sale, Realized Loss	4,800,000	4,000,000	7,700,000	9,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	42,300,000		166,600,000
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 591,600,000		$ 591,600,000		$ 523,200,000
Average Coupon Rate of Debt Securities Percentage	3.78%		3.78%
Average Duration of Debt Securities in Years			6 years 2 months 4 days
Average Maturity of Debt Securities, Years			10 years 10 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 93,500,000	69,900,000	$ 201,500,000	111,200,000
Debt Securities, Available-for-Sale, Realized Gain	0	0	200,000	0
Debt Securities, Available-for-Sale, Realized Loss	8,400,000	$ 4,100,000	11,900,000	$ 6,300,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 14,300,000		$ 93,300,000