Rate And Regulatory Matters Rate and Regulatory Matters (Details of Other Regulatory Liabilities Included in Entergy Corporation and Subsidiaries) (Details) - USD ($) $ in Thousands			1 Months Ended	12 Months Ended
		Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%			35.00%
Regulatory Liability, Noncurrent			$ 1,588,520	$ 1,620,254	$ 1,588,520
Increase (Decrease) in Regulatory Liabilities				803,323	(2,915,795)	$ (158,031)
Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]		989,300	815,900	989,300
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]		36,700	39,100	36,700
Excess Decommissioning Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	31,900	0
Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[2]		151,600	139,700	151,600
Increase (Decrease) in Regulatory Liabilities			30,500
Entergy Arkansas’s Accumulated Accelerated Grand Gulf Amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			44,400	44,400	44,400
Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	44,400	0
Internal Restructuring Guaranteed Credits to Customers [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	39,600	0
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			43,500	68,400	43,500
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			32,400	18,800	32,400
Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			32,100	25,000	32,100
Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			67,900	67,900	67,900
Business Combination Guaranteed Customer Benefits [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			65,800	50,800	65,800
Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	48,600	0
Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[2]		124,800	111,100	124,800
Increase (Decrease) in Regulatory Liabilities			25,000
Income Tax Rate Change [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[2]		0	74,700	0
Entergy Louisiana [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			761,059	748,784	761,059
Increase (Decrease) in Regulatory Liabilities				125,185	(605,453)	(62,351)
Entergy Louisiana [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]		323,700	274,100	323,700
Entergy Louisiana [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]		36,700	39,100	36,700
Entergy Louisiana [Member] | Excess Decommissioning Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	31,900	0
Entergy Louisiana [Member] | Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[2]		151,600	139,700	151,600
Entergy Louisiana [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			26,100	33,400	26,100
Entergy Louisiana [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			32,400	18,800	32,400
Entergy Louisiana [Member] | Business Combination Guaranteed Customer Benefits [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			65,800	50,800	65,800
Entergy Louisiana [Member] | Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[2]		124,800	111,100	124,800
Entergy Louisiana [Member] | Income Tax Rate Change [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	49,900	0
Entergy Arkansas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			363,591	402,668	363,591
Increase (Decrease) in Regulatory Liabilities				341,682	(1,043,507)	(62,994)
Entergy Arkansas [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]		354,000	297,200	354,000
Entergy Arkansas [Member] | Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	35,100	0
Entergy Arkansas [Member] | Internal Restructuring Guaranteed Credits to Customers [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	39,600	0
Entergy Arkansas [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			9,600	4,800	9,600
Entergy Arkansas [Member] | Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	26,000	0
Entergy Mississippi [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			869	33,622	869
Increase (Decrease) in Regulatory Liabilities				131,856	(405,395)	2,986
Entergy Mississippi [Member] | Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	9,300	0
Entergy Mississippi [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			900	1,700	900
Entergy Mississippi [Member] | Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	22,600	0
Entergy New Orleans [Member]
Regulatory Liabilities [Line Items]
Increase (Decrease) in Regulatory Liabilities				28,459	(110,147)	3,997
Entergy Texas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			6,850	47,884	6,850
Increase (Decrease) in Regulatory Liabilities				19,336	(410,968)	(2,106)
Entergy Texas [Member] | Transition to Competition Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			4,800	4,200	4,800
Entergy Texas [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			2,100	4,100	2,100
Entergy Texas [Member] | Income Tax Rate Change [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	23,100	0
Entergy Texas [Member] | Advanced Metering System Surcharge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	16,500	0
System Energy [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			455,991	381,887	455,991
Increase (Decrease) in Regulatory Liabilities				156,802	(331,251)	$ (33,438)
System Energy [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	[1]		311,600	244,600	311,600
System Energy [Member] | Entergy Arkansas’s Accumulated Accelerated Grand Gulf Amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			44,400	44,400	44,400
System Energy [Member] | Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			32,100	25,000	32,100
System Energy [Member] | Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			$ 67,900	$ 67,900	$ 67,900

[1] (a)Offset by related asset.

[2] (b)As a result of the enactment of the Tax Cuts and Jobs Act, in December 2017, and the lowering of the federal corporate income tax rate from 35% to 21% effective January 2018, the Vidalia purchased power agreement regulatory liability was reduced by $30.5 million and the Louisiana Act 55 financing savings obligation regulatory liabilities were reduced by $25.0 million, with corresponding increases to Other regulatory credits on the income statement. The effects of the Tax Cuts and Jobs Act are discussed further in Note 3 to the financial statements.