Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2011	Sep. 30, 2013	Sep. 30, 2014
Depreciation rates on average depreciable property		2.80%	2.60%	2.50%
Depreciation rates on average depreciable utility property		2.50%	2.50%	2.40%
Depreciation rates on average depreciable non-utility property		5.50%	4.10%	3.50%
Accumulated depreciation of non-utility property		$ 185,500,000	$ 203,000,000
Construction expenditures in accounts payable		209,000,000	166,000,000
Options outstanding excluded from the calculation of diluted earnings per share		5,743,013	8,866,542	7,164,319
Stock-based compensation plans award vesting period		3 years
Portion of percentage of interest of River Bend plant costs, generation, revenues and expenses operating the Louisiana retail deregulated portion of River Bend		15.00%
Limit above which incremental revenue shared between ratepayers and shareholders		0.046
Asset Retirement Obligations, Noncurrent		4,458,296,000	3,933,416,000
Estimated fair value of nuclear plant	162,000,000
Carrying value of nuclear plant	517,500,000
Asset impairment charges	355,500,000	154,000,000	322,000,000
After tax asset impairment charge	223,500,000	100,000,000	202,000,000
Other operation and maintenance		123,527,000	341,537,000	355,524,000
Property, Plant and Equipment, Net		213,791,000	199,375,000
Entergy Gulf States Louisiana [Member]
Depreciation rates on average depreciable property		1.80%	1.80%	1.80%
Accumulated depreciation of non-utility property		151,000,000	146,000,000
Construction expenditures in accounts payable		23,400,000	13,100,000
Percentage Interest in River Bend		30.00%
Rate at which electricity sold to retail customers		0.046
Asset Retirement Obligations, Noncurrent		446,619,000	403,084,000
Property, Plant and Equipment, Net		193,407,000	174,134,000
Entergy Louisiana [Member]
Depreciation rates on average depreciable property		2.50%	2.50%	2.40%
Accumulated depreciation of non-utility property		3,200,000	3,000,000
Construction expenditures in accounts payable		48,000,000	31,100,000
Asset Retirement Obligations, Noncurrent		503,734,000	479,086,000
Other operation and maintenance		16,000,000
Property, Plant and Equipment, Net		214,000	396,000
Entergy Texas [Member]
Depreciation rates on average depreciable property		2.50%	2.50%	2.40%
Accumulated depreciation of non-utility property		10,400,000	10,000,000
Construction expenditures in accounts payable		24,100,000	10,900,000
Asset Retirement Obligations, Noncurrent		4,610,000	4,349,000
Property, Plant and Equipment, Net		376,000	376,000
Entergy Arkansas [Member]
Depreciation rates on average depreciable property		2.40%	2.50%	2.50%
Construction expenditures in accounts payable		37,300,000	61,900,000
Asset Retirement Obligations, Noncurrent		818,351,000	723,771,000
Parent Company [Member]
Incremental Common Shares Attributable to Share-based Payment Arrangements		300,000	100,000	300,000
Entergy Mississippi [Member]
Depreciation rates on average depreciable property		2.60%	2.60%	2.60%
Accumulated depreciation of non-utility property		2,200,000	2,100,000
Construction expenditures in accounts payable		7,800,000	2,800,000
Asset Retirement Obligations, Noncurrent		6,786,000	6,401,000
Property, Plant and Equipment, Net		4,642,000	4,670,000
Entergy New Orleans [Member]
Depreciation rates on average depreciable property		3.10%	3.00%	3.00%
Construction expenditures in accounts payable		900,000	1,700,000
Asset Retirement Obligations, Noncurrent		2,511,000	2,347,000
Property, Plant and Equipment, Net		1,016,000	1,016,000
System Energy [Member]
Depreciation rates on average depreciable property		3.00%	2.80%	2.80%
Construction expenditures in accounts payable		7,700,000	6,700,000
Asset Retirement Obligations, Noncurrent		757,918,000	616,157,000
Entergy Wholesale Commodities [Member]
Number of nuclear power plants pending for NRC license renewals			2
Vermont Yankee [Member]
Increase in decommissioning liability			58,000,000
Period of renewal of operating license by NRC					20 years
Lease Expiration Date			Mar. 01, 2032
Asset Retirement Obligations, Noncurrent			10,000,000
Asset Retirement Obligation, Noncurrent, Clean Energy Development Support			5,000,000
Asset Retirement Obligations, Noncurrent, Economic Transitional Payments			5,000,000
Restoration Liability			25,000,000
Other operation and maintenance						291,500,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax						183,700,000
Assets, Fair Value Disclosure			62,000,000
Property, Plant and Equipment, Net			349,000,000
Vermont Yankee [Member] | Entergy Wholesale Commodities [Member]
Increase in decommissioning liability							101,600,000
Maximum [Member] | Vermont Yankee [Member]
Severance and Employee Retention Costs		$ 45,800,000