Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 1,893,000		$ 1,885,000
Average Coupon Rate of Debt Securities Percentage	3.51%
Average Duration of Debt Securities in Years	6 years 3 months 10 days
Average Maturity of Debt Securities, Years	10 years 7 months 17 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 169,000	$ 124,000
Debt Securities, Available-for-Sale, Realized Gain	0	0
Debt Securities, Available-for-Sale, Realized Loss	7,000	9,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	287,000
Debt Securities [Member]
Decommissioning Trust Funds (Textual) [Abstract]
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	0		0
Entergy Arkansas [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 555,000		548,100
Average Coupon Rate of Debt Securities Percentage	2.83%
Average Duration of Debt Securities in Years	6 years 1 month 13 days
Average Maturity of Debt Securities, Years	7 years 10 months 2 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 12,400	15,700
Debt Securities, Available-for-Sale, Realized Gain	0	0
Debt Securities, Available-for-Sale, Realized Loss	400	1,600
Equity Securities, FV-NI, Unrealized Gain (Loss)	84,100
Entergy Louisiana [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 814,800		813,900
Average Coupon Rate of Debt Securities Percentage	3.84%
Average Duration of Debt Securities in Years	6 years 3 months 18 days
Average Maturity of Debt Securities, Years	12 years 7 months 2 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 48,400	67,400
Percentage Interest in River Bend	30.00%
Debt Securities, Available-for-Sale, Realized Gain	$ 200	400
Debt Securities, Available-for-Sale, Realized Loss	2,900	4,900
Equity Securities, FV-NI, Unrealized Gain (Loss)	124,300
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 523,400		$ 523,200
Average Coupon Rate of Debt Securities Percentage	3.65%
Average Duration of Debt Securities in Years	6 years 4 months 28 days
Average Maturity of Debt Securities, Years	10 years 2 months 15 days
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 108,000	41,300
Debt Securities, Available-for-Sale, Realized Gain	200	0
Debt Securities, Available-for-Sale, Realized Loss	3,500	$ 2,300
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 79,100