Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014 reactor program	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2014	Oct. 31, 2014	Dec. 31, 1988 transaction
Commitments And Contingencies [Line Items]
Proceeds from insurance	$ 40,670,000	$ 0	$ 0
Number of financial protection programs	2
Insurance coverage for public liability by American Nuclear Insurers	375,000,000
Maximum retrospective insurance premium obligation per reactor per incident	127,300,000
Maximum total contingent obligation per incident	1,400,000,000
Maximum retrospective insurance premium obligation excluding surcharge per reactor per incident	121,300,000
Surcharge on maximum retrospective premium	5.00%
Rate of maximum retrospective premium per year per nuclear power reactor	19,000,000
ANI combined with Secondary Financial Protection Coverage	13,600,000,000
Additional damage coverage for a terrorist event	100,000,000,000
Number of nuclear reactor included in the Secondary Financial Protection program	104
Total premium for reactor under secondary financial protection program	13,200,000,000
Ownership percentage by a non-affiliated company in Variable interest entity	10.00%
Property insurance minimum requirement per site for nuclear power plant licensees	1,060,000,000
Maximum recovery nuclear insurance policies for property damage caused by Terrorist Act	3,240,000,000
Minimum value of power plants, substations to be covered under conventional property insurance	5,000,000
Purchase of terrorism insurance coverage	300,000,000
Amount of additional insurance coverage per occurrence	20,000,000
Value of properties that do not qualify for low deductible	20,000,000
Four Nuclear Locations [Member]
Commitments And Contingencies [Line Items]
Deductible after additional coverage purchased	2,500,000.0
Operational Perils [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis	400,000,000
Natural Perils [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis	400,000,000
Other Natural Perils [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis	125,000,000
All Other Natural Perils [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis	400,000,000
Flooding Or Property Value Greater Than 20 Million [Member]
Commitments And Contingencies [Line Items]
Deductible after additional coverage purchased	500,000
Accidental Outage Coverage Program [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	327,600,000
Flood and Earthquake [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage	500,000,000
Flood [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage	500,000,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Deductible after additional coverage purchased	100,000
Maximum [Member]
Commitments And Contingencies [Line Items]
Deductible after additional coverage purchased	250,000
Waterford 3 [Member]
Commitments And Contingencies [Line Items]
Weekly indemnity	2,950,000
Maximum indemnity	413,000,000
Waiting period	182 days
Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Weekly indemnity	400,000
Maximum indemnity	56,000,000
Number of insurance policies	4
Waiting period	182 days
Grand Gulf [Member] | Accidental Outage Coverage Program [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	327,600,000
Indian Point 2 Indian Point 3 And Palisades [Member]
Commitments And Contingencies [Line Items]
Weekly indemnity	4,500,000
Maximum indemnity	490,000,000
Waiting period	84 days
Fitzpatrick And Pilgrim [Member]
Commitments And Contingencies [Line Items]
Weekly indemnity	4,000,000
Maximum indemnity	490,000,000
Waiting period	84 days
Vermont Yankee [Member]
Commitments And Contingencies [Line Items]
Waiting period	84 days
Utility Plants [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,600,000,000
Utility Plants [Member] | Turbine And Generator Damage [Member]
Commitments And Contingencies [Line Items]
Property insurance deductibles per occurrence	2,500,000
Utility Plants [Member] | Other Than Turbine And Generator Damage [Member]
Commitments And Contingencies [Line Items]
Property insurance deductibles per occurrence	2,500,000
Utility Plants [Member] | Windstorm, Flood, Earthquake, Or Volcanic Eruption [Member]
Commitments And Contingencies [Line Items]
Property insurance deductibles per occurrence	10,000,000
Additional deductible percentage	10.00%
Utility Plants [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,500,000,000
Utility Plants [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	100,000,000
Entergy Wholesale Commodities [Member] | Accidental Outage Coverage Program [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	327,600,000
Entergy Wholesale Commodities [Member] | Indian Point [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,500,000,000
Entergy Wholesale Commodities [Member] | Indian Point [Member] | Excess Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	100,000,000
Entergy Wholesale Commodities [Member] | Indian Point [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,600,000,000
Entergy Wholesale Commodities [Member] | Fitzpatrick And Pilgrim [Member] | Turbine And Generator Damage [Member]
Commitments And Contingencies [Line Items]
Property insurance deductibles per occurrence	2,500,000
Entergy Wholesale Commodities [Member] | Fitzpatrick And Pilgrim [Member] | Other Than Turbine And Generator Damage [Member]
Commitments And Contingencies [Line Items]
Property insurance deductibles per occurrence	2,500,000
Entergy Wholesale Commodities [Member] | Fitzpatrick And Pilgrim [Member] | Windstorm, Flood, Earthquake, Or Volcanic Eruption [Member]
Commitments And Contingencies [Line Items]
Property insurance deductibles per occurrence	10,000,000
Additional deductible percentage	10.00%
Entergy Wholesale Commodities [Member] | Fitzpatrick And Pilgrim [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,115,000,000
Entergy Wholesale Commodities [Member] | Fitzpatrick And Pilgrim [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,115,000,000
Entergy Wholesale Commodities [Member] | Vermont Yankee [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,060,000,000
Entergy Wholesale Commodities [Member] | Vermont Yankee [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	1,060,000,000
Entergy Wholesale Commodities [Member] | Big Rock Point [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	500,000,000
Entergy Wholesale Commodities [Member] | Big Rock Point [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence	500,000,000
Entergy Arkansas [Member]
Commitments And Contingencies [Line Items]
Estimated cost to restore ANO to service	95,000,000
Deferred Fuel and Purchased Energy Costs Excluded From Revised Energy Cost Rate				65,900,000
Course of construction sublimit	50,000,000
Proceeds from insurance	36,600,000	0	0
Number of nuclear power reactors	2
Percentage of capacity and energy agreed to sell by system energy from grand gulf	36.00%
Average monthly payments under unit power sales agreement	20,200,000
Purchased Percentage Of Capacity And Energy Based On Agreement	17.10%
Entergy Arkansas [Member] | Minimum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	2 years
Entergy Arkansas [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	27 years
Entergy Gulf States Louisiana [Member]
Commitments And Contingencies [Line Items]
Number of nuclear power reactors	1
Number of asbestos lawsuits	400
Number of claimants in asbestos lawsuits	4,000
Purchased Percentage Of Capacity And Energy Based On Agreement	50.00%
Entergy Mississippi [Member]
Commitments And Contingencies [Line Items]
Capital expense related to Baxter Wilson recovery	22,300,000
Operation and maintenance expense incurred for Baxter Wilson recovery	26,600,000
Insurance receivable	28,200,000
Capital expense in excess of insurance receivable	12,900,000
Operation and maintenance expense in excess of insurance receivable	15,300,000
MPSC authorized deferral of other operation and maintenance expenses	6,000,000				6,000,000
Property insurance deductibles per occurrence	20,000,000
Percentage of capacity and energy agreed to sell by system energy from grand gulf	33.00%
Average monthly payments under unit power sales agreement	17,400,000
Purchased Percentage Of Capacity And Energy Based On Agreement	31.30%
Allocated amortization cost in percentage	43.97%
Entergy Mississippi [Member] | Minimum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	2 years
Entergy Mississippi [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	27 years
Entergy Texas [Member]
Commitments And Contingencies [Line Items]
Number of asbestos lawsuits	400
Number of claimants in asbestos lawsuits	4,000
System Energy [Member]
Commitments And Contingencies [Line Items]
Number of nuclear power reactors	1
Ratio of debt to total liabilities and equity to be maintained under Reimbursement Agreement	70.00%
Ratio of adjusted net income to interest expense to be maintained under Reimbursement Agreement.	1.50
System Energy [Member] | Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Number of sale leaseback transactions						2
Sold and leased back undivided ownership interests in Grand Gulf	500,000,000
Entergy New Orleans [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis	50,000,000
Number of asbestos lawsuits	400
Number of claimants in asbestos lawsuits	4,000
Percentage of capacity and energy agreed to sell by system energy from grand gulf	17.00%
Average monthly payments under unit power sales agreement	9,800,000
Purchased Percentage Of Capacity And Energy Based On Agreement	24.70%
Allocated amortization cost in percentage	29.80%
Entergy New Orleans [Member] | Operational Perils [Member]
Commitments And Contingencies [Line Items]
Self-insured retention per occurrence	20,000,000
Entergy New Orleans [Member] | Natural Perils [Member]
Commitments And Contingencies [Line Items]
Self-insured retention per occurrence	40,000,000
Entergy New Orleans [Member] | Minimum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	2 years
Entergy New Orleans [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	27 years
Entergy Louisiana [Member]
Commitments And Contingencies [Line Items]
Payments made under purchased power agreement	152,800,000	181,100,000	125,000,000
Required energy for the production of Vidalia project in percentage	94.00%
Estimated Payments Under Purchased Power Agreement in Next Twelve Months	148,500,000
Estimated Payments Under Purchased Power Agreement in Year Two and Thereafter	2,060,000,000
Credit rates agreed by subsidiary for each year under settlement related to tax benefits from tax treatment of purchased power agreement	11,000,000
Number of years for which credit rates agreed by subsidiary under settlement related to tax benefits from the tax treatment of purchased power agreement	10 years
Resulted credit rate with interest by IRS settlement	11,300,000
Amount of remaining benefits of tax credit by crediting rate payers	20,235,000
Maximum period up to which remaining benefit of tax accounting election shared	15 years
Number of nuclear power reactors	1
Number of asbestos lawsuits	400
Number of claimants in asbestos lawsuits	4,000
Percentage of capacity and energy agreed to sell by system energy from grand gulf	14.00%
Average monthly payments under unit power sales agreement	$ 8,000,000
Purchased Percentage Of Capacity And Energy Based On Agreement	26.90%
Allocated amortization cost in percentage	26.23%
Entergy Louisiana [Member] | Minimum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	2 years
Entergy Louisiana [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Amortization period of cost	27 years