Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,138,000,000		$ 2,121,000,000
Average Coupon Rate of Debt Securities Percentage	4.12%
Average Duration of Debt Securities in Years	6 years 4 months 6 days
Average Maturity of Debt Securities, Years	10 years 11 months 8 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 262,000,000	$ 169,000,000
Debt Securities, Available-for-Sale, Realized Gain	1,000,000	0
Debt Securities, Available-for-Sale, Realized Loss	4,000,000	7,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	190,000,000
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	0		0
Entergy Arkansas [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 604,300,000		603,500,000
Average Coupon Rate of Debt Securities Percentage	3.71%
Average Duration of Debt Securities in Years	6 years 2 months 26 days
Average Maturity of Debt Securities, Years	8 years 5 months 26 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	12,400,000
Debt Securities, Available-for-Sale, Realized Gain	0	0
Debt Securities, Available-for-Sale, Realized Loss	0	400,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	56,900,000
Entergy Louisiana [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 943,000,000		931,500,000
Average Coupon Rate of Debt Securities Percentage	4.37%
Average Duration of Debt Securities in Years	6 years 5 months 4 days
Average Maturity of Debt Securities, Years	12 years 8 months 1 day
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 110,000,000.0	48,400,000
Percentage Interest in River Bend	30.00%
Debt Securities, Available-for-Sale, Realized Gain	$ 100,000	200,000
Debt Securities, Available-for-Sale, Realized Loss	1,500,000	2,900,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	78,800,000
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 590,700,000		$ 585,500,000
Average Coupon Rate of Debt Securities Percentage	4.16%
Average Duration of Debt Securities in Years	6 years 4 months 6 days
Average Maturity of Debt Securities, Years	10 years 8 months 15 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 152,300,000	108,000,000.0
Debt Securities, Available-for-Sale, Realized Gain	600,000	200,000
Debt Securities, Available-for-Sale, Realized Loss	2,700,000	$ 3,500,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 53,800,000