Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Jun. 28, 2022
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts	$ 0	$ 3,768,000	$ 0	$ (3,453,000)
Amortized cost of debt securities	$ 1,874,000,000		$ 1,874,000,000		$ 1,852,000,000
Average coupon rate of debt securities	3.15%		3.15%
Average duration of debt securities, years			6 years 4 months 17 days
Average maturity of debt securities, years			10 years 9 months 21 days
Proceeds from the dispositions of debt securities	$ 136,000,000	333,000,000	$ 260,000,000	636,000,000
Equity Securities, FV-NI, Unrealized Loss	211,000,000		372,000,000
Debt Securities, Available-for-sale, Realized Gain		1,000,000	1,000,000	2,000,000
Debt Securities, Available-for-sale, Realized Loss	8,000,000	16,000,000	17,000,000	28,000,000
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale				1,500,000
Debt Securities [Member]
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts			0		0
Entergy Arkansas [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 546,800,000		$ 546,800,000		539,800,000
Average coupon rate of debt securities	2.46%		2.46%
Average duration of debt securities, years			5 years 11 months 8 days
Average maturity of debt securities, years			7 years 5 months 4 days
Proceeds from the dispositions of debt securities	$ 900,000	8,800,000	$ 16,600,000	15,900,000
Equity Securities, FV-NI, Unrealized Loss	62,100,000		109,400,000
Debt Securities, Available-for-sale, Realized Gain	0	30,000.00	0	60,000.00
Debt Securities, Available-for-sale, Realized Loss	100,000	300,000	1,700,000	500,000
Entergy Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 804,000,000		$ 804,000,000		789,100,000
Average coupon rate of debt securities	3.69%		3.69%
Average duration of debt securities, years			6 years 6 months 14 days
Average maturity of debt securities, years			13 years 1 month 6 days
Proceeds from the dispositions of debt securities	$ 65,200,000	120,300,000	$ 132,600,000	240,900,000
Percentage Interest in River Bend			30.00%
Equity Securities, FV-NI, Unrealized Loss	90,300,000		$ 159,600,000
Debt Securities, Available-for-sale, Realized Gain	100,000	200,000	500,000	1,100,000
Debt Securities, Available-for-sale, Realized Loss	4,000,000	6,700,000	9,000,000	12,200,000
System Energy [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 523,400,000		$ 523,400,000		$ 522,700,000
Average coupon rate of debt securities	2.97%		2.97%
Average duration of debt securities, years			6 years 6 months 21 days
Average maturity of debt securities, years			10 years 6 months 29 days
Proceeds from the dispositions of debt securities	$ 69,900,000	67,800,000	$ 111,200,000	104,000,000
Equity Securities, FV-NI, Unrealized Loss	58,400,000		102,800,000
Debt Securities, Available-for-sale, Realized Gain	0	100,000	0	200,000
Debt Securities, Available-for-sale, Realized Loss	$ 4,100,000	$ 4,600,000	$ 6,300,000	$ 5,300,000
Palisades [Member]
Decommissioning Trust Funds [Abstract]
Decommissioning Fund Investments, Fair Value						$ 552,000,000