Rate And Regulatory Matters Rate and Regulatory Matters (Details of Other Regulatory Liabilities Included in Entergy Corporation and Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	$ 1,383,609		$ 1,295,955
Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	656,700	[1]	529,600	[1]
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	27,700	[1]	31,500	[1]
Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	242,800		263,100
Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	53,600		60,700
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	40,200		46,100
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	82,700	[1]	72,300	[1]
Grand Gulf Sale Leaseback [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	79,500		92,300
Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	156,000		156,000
Entergy Arkansas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	254,036		219,370
Entergy Arkansas [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	254,000	[1]
Entergy Arkansas [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent			214,100	[1]
Entergy Arkansas [Member] | Deferred Project Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	0		4,700
Entergy Arkansas [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	0		600
Entergy Gulf States Louisiana [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	176,305		159,429
Entergy Gulf States Louisiana [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	85,900	[1]	64,100	[1]
Entergy Gulf States Louisiana [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	27,700	[1]	31,500	[1]
Entergy Gulf States Louisiana [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	300		800
Entergy Gulf States Louisiana [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	36,900	[1]	35,300	[1]
Entergy Gulf States Louisiana [Member] | Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	25,500		25,500
Entergy Gulf States Louisiana [Member] | Gas Hedge Contracts Assets [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	0		2,200
Entergy Louisiana [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	546,084		533,247
Entergy Louisiana [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	123,200	[1]	98,900	[1]
Entergy Louisiana [Member] | Vidalia Purchased Power Agreement [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	242,800		263,100
Entergy Louisiana [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	3,900		3,700
Entergy Louisiana [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	45,700	[1]	37,000	[1]
Entergy Louisiana [Member] | Louisiana Act 55 Financing Obligation [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	130,500		130,500
Entergy Texas [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	5,125		5,194
Entergy Texas [Member] | Line Loss Adjustment [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	0		1,000
Entergy Texas [Member] | Transition to Competition Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	5,100		4,200
System Energy [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	371,110		349,846
System Energy [Member] | Unrealized Gain on Nuclear Decommissioning Trust Funds [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	193,600	[1]	152,400	[1]
System Energy [Member] | Entergy Mississippi’s accumulated accelerated Grand Gulf amortization [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	53,600		60,700
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	$ 79,500		$ 92,300

[1] (a)Offset by related asset.