Commitments and Contingencies Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2023	Mar. 31, 2023	Feb. 28, 2014	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2018	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Litigation proceeds for reimbursement of spent nuclear fuel storage costs						$ 23,655	$ 32,367
Asset Impairment Charges				$ 38,078	$ (143)	38,078	(163,464)
Indian Point
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party	$ 59,000
Damages awarded for previously recorded operation and maintenance	15,000
Damages awarded for previously recorded taxes other than income taxes	1,000
Damages awarded for previously recorded nuclear fuel expense	6,000
Damages awarded for costs previously recorded as asset retirement obligation	$ 18,000
Entergy Arkansas [Member]
Loss Contingencies [Line Items]
Litigation proceeds for reimbursement of spent nuclear fuel storage costs						17,933	0
Litigation Settlement, Amount Awarded from Other Party								$ 21,000
Asset Impairment Charges				78,434	$ 0	$ 78,434	$ 0
Asset impairment charge for undepreciated balance in capital costs				9,500
Estimated Cost To Restore ANO To Service										$ 95,000
Proceeds From Insurance Settlement, Operating and Investing Activities									$ 50,000
Estimated Cost To Restore ANO To Service										$ 95,000
Proceeds From Insurance Settlement, Operating and Investing Activities									$ 50,000
Entergy Arkansas [Member] | Deferred Fuel Costs
Loss Contingencies [Line Items]
Asset Impairment Charges				$ 68,900
Entergy Arkansas [Member] | ANO
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party		$ 41,000
Damages awarded for previously recorded operation and maintenance		10,000
Damages awarded for previously recorded taxes other than income taxes		2,000
Damages awarded for previously capitalized nuclear fuel expense [Abstract]		8,000
Damages awarded for previously recorded materials and supplies [Abstract]		3,000
Damages awarded for previously recorded nuclear fuel expense		$ 18,000
Deferred Fuel and Purchased Energy Costs Excluded From Revised Energy Cost Rate			$ 65,900
Deferred Fuel and Purchased Energy Costs Excluded From Revised Energy Cost Rate			$ 65,900