Rate And Regulatory Matters Rate and Regulatory Matters (Details of Other Regulatory Liabilities Included in Entergy Corporation and Subsidiaries) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2015
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		$ 1,572,929	$ 1,414,898	$ 107,000
Waterford 3 Steam Generator Replacement Cost Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		68,000	31,700
Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	735,500	611,700
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	32,700	28,200
Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		202,400	222,600
Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		39,300	46,400
Entergy Arkansas’s Accumulated Accelerated Grand Gulf Amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		44,400	44,400
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		79,800	32,500
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	53,900	68,300
Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		67,900	67,900
Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		165,500	156,000
Business Combination Guaranteed Customer Benefits [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		83,500	105,200
Entergy Arkansas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		305,907	242,913
Entergy Arkansas [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	280,800	236,100
Entergy Arkansas [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		25,100	6,800
Entergy Louisiana [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		880,974	818,623
Entergy Louisiana [Member] | Waterford 3 Steam Generator Replacement Cost Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		68,000	31,700
Entergy Louisiana [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	235,400	196,900
Entergy Louisiana [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	32,700	28,200
Entergy Louisiana [Member] | Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		202,400	222,600
Entergy Louisiana [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		28,700	9,700
Entergy Louisiana [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	53,900	68,300
Entergy Louisiana [Member] | Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		165,500	156,000
Entergy Louisiana [Member] | Business Combination Guaranteed Customer Benefits [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		83,500	105,200
Entergy Louisiana [Member] | Gas Hedging Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		10,900	0
Entergy Texas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		8,502	6,396
Entergy Texas [Member] | Transition to Competition Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		6,200	6,400
Entergy Texas [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		2,300	0
System Energy [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		370,862	337,424
System Energy [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]	219,300	178,700
System Energy [Member] | Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		39,300	46,400
System Energy [Member] | Entergy Arkansas’s Accumulated Accelerated Grand Gulf Amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		44,400	44,400
System Energy [Member] | Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent		$ 67,900	$ 67,900

[1] (a)Offset by related asset.