Dispositions Dispositions (Narrative) (Details)	1 Months Ended		3 Months Ended
	Mar. 31, 2017 USD ($) MW	Aug. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Payments to Acquire Property, Plant, and Equipment			$ 0	$ (947,778,000)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			(16,270,000)	0
Fitzpatrick [Member]
Capacity Of Power Plant Unit | MW	838
Proceeds from Divestiture of Businesses	$ 110,000,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	(16,000,000)
Cost of Reimbursable Expense	8,000,000
Non-refundable signing fee paid upon agreement and assumption by Exelon of certain liabilities		$ 10,000,000
Income tax benefit resulting from sale of FitzPatrick			44,000,000
Decommissioning Fund Investments, Fair Value	805,000,000		805,000,000
Asset Retirement Obligation	727,000,000		727,000,000
Other operation and maintenance expense reimbursement			98,000,000
Reimbursement Revenue			7,000,000
Reimbursement for taxes other than income taxes			3,000,000
Nuclear defueling credit			10,000,000
Net Book Value	$ 0		0
Entergy Arkansas [Member]
Payments to Acquire Property, Plant, and Equipment			0	(236,947,000)
Entergy Louisiana [Member]
Payments to Acquire Property, Plant, and Equipment			0	(473,888,000)
Entergy New Orleans [Member]
Payments to Acquire Property, Plant, and Equipment			$ 0	$ (236,944,000)