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, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Regulatory Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%				35.00%	35.00%
Regulatory Liability, Noncurrent			$ 2,323,851	$ 1,961,005
Increase (Decrease) in Regulatory Liabilities			(238,669)	14,781	$ 803,323
Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			1,694,100	1,300,100
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			29,700	37,200
Excess Decommissioning Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	21,200
Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			115,700	127,300
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
Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			43,500	51,100
Internal Restructuring Guaranteed Credits to Customers [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			26,400	33,000	40,000
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			35,500	39,000
Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			10,700	17,800
Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			55,600	55,600
Business Combination Guaranteed Customer Benefits [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			21,500	35,700
Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			75,100	62,300
Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			144,300	97,100
Increase (Decrease) in Regulatory Liabilities		$ 25,000
Income Tax Rate Change [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			7,300	13,900
Advanced Metering System Surcharge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			20,100	25,300
Entergy Louisiana [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			918,293	794,140
Increase (Decrease) in Regulatory Liabilities			(71,698)	35,881	125,185
Entergy Louisiana [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			567,700	436,500
Entergy Louisiana [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			29,700	37,100
Entergy Louisiana [Member] | Excess Decommissioning Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	21,200
Entergy Louisiana [Member] | Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			115,700	127,300
Entergy Louisiana [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			39,400	39,200
Entergy Louisiana [Member] | Business Combination Guaranteed Customer Benefits [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			21,500	35,700
Entergy Louisiana [Member] | Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			144,300	97,100
Entergy Arkansas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			686,872	559,555
Increase (Decrease) in Regulatory Liabilities			(106,878)	(39,293)	341,682
Entergy Arkansas [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			597,400	460,300
Entergy Arkansas [Member] | Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			43,500	46,600
Entergy Arkansas [Member] | Internal Restructuring Guaranteed Credits to Customers [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			26,400	33,000
Entergy Arkansas [Member] | Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			19,600	19,700
Entergy Mississippi [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			15,828	21,512
Increase (Decrease) in Regulatory Liabilities			18,672	21,524	131,856
Entergy Mississippi [Member] | Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			1,000	2,400
Entergy Mississippi [Member] | Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			0	4,500
Entergy Mississippi [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			600	0
Entergy Mississippi [Member] | Grand Gulf Over-Recovery [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			14,200	14,600
Entergy New Orleans [Member]
Regulatory Liabilities [Line Items]
Increase (Decrease) in Regulatory Liabilities			4,728	22,105	28,459
Entergy Texas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			32,297	42,085
Increase (Decrease) in Regulatory Liabilities			57,477	105,517	19,336
Entergy Texas [Member] | Transition to Competition Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			3,200	3,800
Entergy Texas [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			2,500	2,600
Entergy Texas [Member] | Income Tax Rate Change [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			6,500	10,400
Entergy Texas [Member] | Advanced Metering System Surcharge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			20,100	25,300
System Energy [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			665,396	533,415
Increase (Decrease) in Regulatory Liabilities			(140,965)	(130,949)	$ 156,802
System Energy [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			529,000	403,300
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] | Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			10,700	17,800
System Energy [Member] | Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			55,600	55,600
System Energy [Member] | Grand Gulf Sale Leaseback accumulated deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			$ 25,700	$ 12,300