Decommissioning Trust Funds (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jun. 28, 2022
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 1,881,000,000		$ 1,881,000,000		$ 1,852,000,000
Average coupon rate of debt securities	3.37%		3.37%
Average duration of debt securities, years			6 years 3 months 18 days
Average maturity of debt securities, years			10 years 8 months 15 days
Proceeds from the dispositions of debt securities	$ 226,000,000	$ 119,000,000	$ 486,000,000	$ 755,000,000
Equity Securities, FV-NI, Unrealized Loss	(99,000,000)
Debt Securities, Available-for-sale, Realized Gain		200,000	1,000,000	2,000,000
Debt Securities, Available-for-sale, Realized Loss	11,000,000	8,000,000	28,000,000	36,000,000
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale				1,500,000
Equity Securities, FV-NI, Unrealized Gain			272,000,000
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	$ 548,900,000		$ 548,900,000		539,800,000
Average coupon rate of debt securities	2.58%		2.58%
Average duration of debt securities, years			5 years 9 months 10 days
Average maturity of debt securities, years			7 years 4 months 6 days
Proceeds from the dispositions of debt securities	$ 1,800,000	17,200,000	$ 18,400,000	33,100,000
Equity Securities, FV-NI, Unrealized Loss	(29,300,000)
Debt Securities, Available-for-sale, Realized Gain	0	0	0	100,000
Debt Securities, Available-for-sale, Realized Loss	100,000	2,000,000	1,800,000	2,500,000
Equity Securities, FV-NI, Unrealized Gain			80,000,000
Entergy Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 809,900,000		$ 809,900,000		789,100,000
Average coupon rate of debt securities	3.87%		3.87%
Average duration of debt securities, years			6 years 8 months 19 days
Average maturity of debt securities, years			13 years 1 month 9 days
Proceeds from the dispositions of debt securities	$ 148,100,000	47,600,000	$ 280,700,000	288,500,000
Percentage Interest in River Bend			30.00%
Equity Securities, FV-NI, Unrealized Loss	(42,300,000)
Debt Securities, Available-for-sale, Realized Gain	0	200,000	$ 500,000	1,300,000
Debt Securities, Available-for-sale, Realized Loss	8,600,000	2,800,000	17,600,000	15,000,000
Equity Securities, FV-NI, Unrealized Gain			117,200,000
System Energy [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	$ 522,600,000		$ 522,600,000		$ 522,700,000
Average coupon rate of debt securities	3.36%		3.36%
Average duration of debt securities, years			6 years 1 month 24 days
Average maturity of debt securities, years			10 years 3 months 3 days
Proceeds from the dispositions of debt securities	$ 76,200,000	54,600,000	$ 187,300,000	158,600,000
Equity Securities, FV-NI, Unrealized Loss	(27,500,000)
Debt Securities, Available-for-sale, Realized Gain	0	20,000.00	0	200,000
Debt Securities, Available-for-sale, Realized Loss	$ 2,700,000	$ 3,000,000	9,100,000	$ 8,300,000
Equity Securities, FV-NI, Unrealized Gain			$ 75,200,000
Palisades [Member]
Decommissioning Trust Funds [Abstract]
Decommissioning Fund Investments, Fair Value						$ 552,000,000