Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,148,000,000		$ 2,148,000,000		$ 2,121,000,000
Average Coupon Rate of Debt Securities Percentage	4.14%		4.14%
Average Duration of Debt Securities in Years			6 years 4 months 20 days
Average Maturity of Debt Securities, Years			10 years 9 months 21 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 227,000,000	$ 161,000,000	$ 489,000,000	$ 330,000,000
Debt Securities, Available-for-Sale, Realized Gain	1,000,000	0	2,000,000	1,000,000
Debt Securities, Available-for-Sale, Realized Loss	4,000,000	14,000,000	8,000,000	20,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	536,000,000		513,000,000
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	$ 606,100,000		$ 606,100,000		603,500,000
Average Coupon Rate of Debt Securities Percentage	3.75%		3.75%
Average Duration of Debt Securities in Years			6 years 2 months 12 days
Average Maturity of Debt Securities, Years			8 years 5 months 15 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	5,500,000	$ 0	17,900,000
Debt Securities, Available-for-Sale, Realized Gain	0	100,000	0	100,000
Debt Securities, Available-for-Sale, Realized Loss	0	400,000	0	900,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	138,000,000		126,700,000
Entergy Louisiana [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 947,300,000		$ 947,300,000		931,500,000
Average Coupon Rate of Debt Securities Percentage	4.40%		4.40%
Average Duration of Debt Securities in Years			6 years 6 months 25 days
Average Maturity of Debt Securities, Years			12 years 4 months 17 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 71,500,000	62,500,000	$ 181,500,000	110,900,000
Percentage Interest in River Bend			30.00%
Debt Securities, Available-for-Sale, Realized Gain	100,000	100,000	$ 200,000	200,000
Debt Securities, Available-for-Sale, Realized Loss	2,400,000	4,800,000	4,000,000.0	7,700,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	267,900,000		254,600,000
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 595,000,000		$ 595,000,000		$ 585,500,000
Average Coupon Rate of Debt Securities Percentage	4.13%		4.13%
Average Duration of Debt Securities in Years			6 years 3 months 7 days
Average Maturity of Debt Securities, Years			10 years 8 months 23 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 155,300,000	93,500,000	$ 307,600,000	201,500,000
Debt Securities, Available-for-Sale, Realized Gain	800,000	0	1,300,000	200,000
Debt Securities, Available-for-Sale, Realized Loss	1,400,000	$ 8,400,000	4,000,000.0	$ 11,900,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 130,500,000		$ 131,300,000