Rate And Regulatory Matters (Narrative) (Details)		1 Months Ended																																																									3 Months Ended		12 Months Ended					20 Months Ended	36 Months Ended
		Jan. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Feb. 29, 2016 USD ($)	Jan. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	May 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Jan. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Aug. 31, 2014 USD ($) $ / unit shares	Jul. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	May 31, 2014 USD ($) $ / unit	Apr. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Aug. 30, 2013	Jul. 31, 2013 USD ($)	Apr. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)	Jan. 31, 2013 USD ($) party	Dec. 31, 2012 USD ($)	Nov. 30, 2012	Sep. 30, 2012 USD ($)	Jul. 31, 2012 USD ($)	Apr. 30, 2012 USD ($)	Feb. 29, 2012 USD ($) shares	Nov. 30, 2011 USD ($)	Oct. 31, 2011 USD ($) issue	Jul. 31, 2010 USD ($) $ / unit shares	Jun. 30, 2010 USD ($)	Dec. 31, 2009 USD ($)	Aug. 31, 2008 USD ($) $ / unit shares	Jul. 31, 2008 USD ($) shares	Apr. 30, 2008	Apr. 30, 2007 USD ($)	Jan. 31, 2007	Jun. 30, 2005	Aug. 31, 2003 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2005 outage	May 02, 2003	Mar. 31, 2016 USD ($)	Mar. 31, 2014 USD ($)	Apr. 30, 2010 USD ($)	Aug. 26, 2008 USD ($)	Jul. 29, 2008 USD ($)
Rate and Regulatory Matters [Abstract]
Asset Write-Offs, Impairments, And Related Charges																																																													$ 2,835,637,000	$ 2,104,906,000	$ 123,527,000
Payments to Acquire Other Property, Plant, and Equipment																																																													(949,329,000)	0	0
Asset Write-Offs, Impairments, And Related Charges																																																													2,835,637,000	2,104,906,000	179,752,000
Write-Off of Waterford 3 Replacement Steam Generator														$ 77,000,000
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills																																												$ 12,000,000
Other Regulatory Assets			$ 4,769,913,000											4,704,796,000																																													$ 4,704,796,000		4,769,913,000	4,704,796,000
Period to File Briefs																																																30 days
Period to File Reply Briefs																																																21 days
Operation and maintenance expense																																																													3,296,711,000	3,354,981,000	3,310,536,000
Income before income taxes																																																													(1,381,762,000)	(799,661,000)	1,549,854,000
Deferred Fuel Cost			108,465,000											0																																													0		$ 108,465,000	0
Period of Prohibited Refunds																																																20 months						20 months												20 years
Number of Issues D.C. Circuit Ordered to Remand | issue																																																2
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Portion of Waterford 3 purchase price satisfied through issuance of debt											$ 52,000,000
Rate and Regulatory Matters [Abstract]
Decrease in estimated costs at completion for Ninemile 6 project																		$ 76,000,000
Rate Increase Included in Formula Rate Plan																$ 35,700,000
Adjustment to formula rate plan for reduction in MISO cost recovery mechanism																5,500,000
Bond proceeds loaned by LCDA to LURC under Louisiana Act 55 financing																										$ 309,000,000
Annual customer credits																												$ 6,200,000
LCDA issuance of bonds under Louisiana Act 55 financing																										314,850,000
Amount transfered to restricted escrow account as storm damage reserve																										16,000,000
Elimination of the Interruptible Load Period																																																							12 months
Period Prior to Billing, Recovery of Electric Fuel and Purchased Power Costs																																																													2 months
Formula rate plan extension request MISO Only scenario revenue offset																																							$ 2,000,000
Formula rate plan extension request sharing mechanism company																																							40.00%
Formula Rate Plan Period																																							3 years
Amortization period of cost																																																													27 years
Formula rate plan extension request sharing mechanism customers																																							60.00%
Formula rate plan extension request MISO Only scenario common equity basis point range																																							75.00%
Formula rate plan extension request MISO Only scenario midpoint return on common equity																																							10.40%
Formula rate plan extension request MISO Only scenario authorized return on common equity																																							10.40%
Formula rate plan extension request MISO Only scenario revenue increase authorization																																							$ 145,000,000
Payments to Acquire Other Property, Plant, and Equipment																																																													$ (474,670,000)	0	0
Storm restoration costs deemed prudently incurred - Hurricane Isaac																												290,800,000
Requested Replenishment of Storm Escrow Accounts Hurricane Issac																												$ 290,000,000
Earned return on common equity									9.07%																			9.95%			8.13%							10.40%
Approved Recovery Through Rider Revenues																							$ 915,000
Formula Rate Plan Extension Period																																															1 year
Earnings bandwidth, basis points within bandwidth																												0.00%
Rate increase																												$ 9,300,000	$ 10,000,000		$ 5,560,000							$ 13,000,000
Rate Increase Through MISO Recovery Rider																												$ 853,000
Rate Increase Period																												4 years			3 years							3 years
Adjustment to formula rate plan to decrease additional capacity mechanism																$ 17,800,000
Rate increase value to reflect special formula rate plan rate implementation adjustment																							41,600,000
Project and Replacement Power Cost Disallowances														2,000,000													$ 71,000,000
ALJ Recommended Charges Related to Waterford 3 Steam Generator Project																																																											77,000,000
Intervenor Recommended Project and Replacement Power Cost Disallowances																											$ 141,000,000
Asset Write-Offs, Impairments, And Related Charges																							16,000,000
ALJ Recommended Disallowance of Capital Costs														67,000,000
Write-Off of Waterford 3 Replacement Steam Generator																																																											45,000,000
Regulatory Charge Recorded Due to Probability of Non-Recovery Per ALJ Recommendation																																																											32,000,000
Estimated Revenue Requirement Implemented for Ninemile 6																							51,100,000
Estimated costs at completion for Ninemile 6 project																		648,000,000
Refund To Customers			71,000,000
Refund to Customers Credited Through Formula Rate Plan			68,000,000
Earned return on common equity																9.09%
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies																																									$ 7,000,000
Other Regulatory Assets			1,168,058,000											1,217,874,000																																													1,217,874,000		1,168,058,000	1,217,874,000
Proceed from loan by LCDA to corporation LURC								$ 148,600,000
Operation and maintenance expense																																																													923,779,000	997,546,000	907,308,000
Income before income taxes																																																													$ 711,781,000	625,310,000	631,074,000
Refund to customers per LPSC Staff January 2013 audit report																																								$ 1,900,000
Realignment of the recovery from Entergy Louisiana's fuel adjustment clause to base rates per LPSC January 2013 audit report																																								$ 1,000,000
Number of Parties That Intervened in LPSC Proceeding | party																																								2
Rate Increase Included in Legacy Formula Rate Plan																		10,000,000
Allowed Maximum Deferred External Costs Associated with Business Combination																		25,000,000
Deferred External Costs Associated with Business Combination																																																														16,000,000
Minimum customer benefits																												$ 30,800,000
Bond proceeds transfered to company under Louisiana Act 55 financing																										293,000,000
Payments to Acquire Property, Plant, and Equipment											474,000,000
Estimated Customer Benefits Anticipated with Business Combination																									$ 128,000,000
Proposed Guaranteed Savings Projected for Business Combination																									97,000,000
Customer Benefits Anticipated with Business Combination Per Stipulated Settlement with LPSC																		107,000,000
Upper Limit on Rates																		30,000,000
LPSC staff recommended fuel adjustment clause refund including interest			3,000,000								8,600,000
Previously Recorded Provision For Refund to Customers Due to Waterford 3 Steam Generator Project Settlement			48,000,000
Regulatory Charge Due to Waterford 3 Steam Generator Project Settlement			23,000,000
LPSC previously recommended disallowance of portion of refund to customers						$ 3,400,000
Adjustment to formula rate plan to decrease Legacy Entergy Gulf States Louisiana revenues due to effect of system agreement termination									$ 58,700,000
Adjustment to formula rate plan for increase in MISO cost recovery mechanism									11,000,000
Estimated Net benefit to Customers Anticipated with AMI Deployment				$ 607,000,000
Book Value of Existing Meters to be Retired with AMI Deployment														92,000,000																																													92,000,000			92,000,000
Adjustment to formula rate plan to increase Legacy Entergy Louisiana additional capacity mechanism									14,200,000
Adjustment to formula rate plan to increase Legacy Entergy Louisiana revenues due to effects of system agreement termination									10,000,000
Adjustment to formula rate plan to increase Legacy Entergy Gulf States Louisiana additional capacity mechanism									500,000
Entergy Louisiana [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Minimum amount of benefits committed to pass on to the customers																																																																$ 40,000,000
Prospective Annual rate reductions for five years																																																																8,000,000
Bond issued by LCDA																																																																							$ 687,700,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																																																					$ 152,000,000
Amount Transferred to Entergy Louisiana																																																					527,000,000
Proceed from loan by LCDA to corporation LURC																																																					679,000,000
Amount used to acquire membership interest units in wholly owned Subsidiary																																																					$ 545,000,000
Class preferred, non-voting, membership interest units | shares																																																					5,449,861.85
Annual distribution rate																																																					10.00%
Amount withdrawn from restricted escrow account as approved by units of wholly owned subsidiary																																																					$ 17,800,000
Entergy Louisiana [Member] | Hurricane Gustav and Ike [Member]
Rate and Regulatory Matters [Abstract]
Total recoverable costs																																																			$ 628,000,000
Unrecoverable storm cost charged to earning																																																			11,600,000
Replenishment amount for storm reserve spending																																																			$ 290,000,000
Minimum amount of benefits committed to pass on to the customers																																																																					$ 43,300,000
Prospective Annual rate reductions for five years																																																																					$ 8,700,000
Bond issued by LCDA																																																	$ 713,000,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																																																	290,000,000
Amount Transferred to Entergy Louisiana																																																	412,700,000
Proceed from loan by LCDA to corporation LURC																																																	702,700,000
Amount used to acquire membership interest units in wholly owned Subsidiary																																																	$ 412,700,000
Class preferred, non-voting, membership interest units | shares																																																	4,126,940.15
Annual distribution rate																																																	9.00%
Liquidation price per unit | $ / unit																																																	100
Net worth required under terms of membership interest																																																	$ 1,000,000,000
Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Rate Increase Included in Formula Rate Plan								$ 19,400,000
Requested Rate Increase Including New Depreciation Rates																												$ 30,000,000
MPSC authorized deferral of other operation and maintenance expenses																								$ 6,000,000
Amortization period of cost																																																													27 years
Earned return on common equity								10.07%																				10.59%
Increase in expenses to be collected through ad valorem tax adjustment rider								$ 4,300,000
Public Utilities, Approved Return on Equity, Percentage																								10.07%
Increase in Annual Funding for Storm Reserve																																				$ 1,750,000.00
Authorized Storm Damage Reserve Balance						15,000,000																$ 15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level																					$ 10,000,000																																								$ 10,000,000
Upper limit not exceeded for storm accrual balance										$ 10,000,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies																																									23,000,000
Other Regulatory Assets			342,213,000											328,681,000																																													328,681,000		342,213,000	328,681,000
Storm Restoration Costs Incurred Hurricane Isaac																																				32,000,000
Storm Restoration Costs Incurred That Are Recoverable Through Formula Rate Plan Hurricane Isaac																																				700,000
Storm Reserve Accrual Hurricane Isaac				0																	$ 0															$ 750,000
Operation and maintenance expense																																																													250,443,000	261,255,000	256,339,000
Cost incurred in planning evaluation and monitoring																																																$ 57,000,000
Write-Off Of Regulatory Asset For New Nuclear																																																													0	0	56,225,000
Income before income taxes																																																													173,038,000	154,580,000	130,531,000
Deferred Fuel Cost			6,957,000											0																																													0		$ 6,957,000	0						$ 60,400,000
Natural Gas Cost | $ / unit																													4.50
Public Utilities, Requested Rate Increase (Decrease), Amount											$ 32,600,000																	$ 49,000,000
Net increase in revenues per joint stipulation entered into with MPSC																								$ 16,000,000
Deferred Fuel Over-Recovery Balance																			$ 58,300,000
Under-Recovery Under Power Management Rider																			12,300,000
Net Over-Recovery of Rider Revenues													$ 48,000,000					46,000,000
Projected Over-Recovery Energy Cost Recovery Rider				2,000,000								$ 68,000,000
Estimated nominal benefit to Customers Anticipated with AMI Deployment				496,000,000
Public Utilities, Requested Return on Equity, Percentage											9.96%
Estimated Net benefit to Customers Anticipated with AMI Deployment				183,000,000
Book Value of Existing Meters to be Retired with AMI Deployment														56,000,000																																													56,000,000			56,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount											$ 32,600,000																	$ 49,000,000
Public Utilities, Approved Rate Increase (Decrease), Amount								23,700,000
Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Power blocks																						2
Adjustment to formula rate plan to increase additional capacity mechanism																$ 4,300,000
Formula rate plan extension request sharing mechanism company																																							40.00%
Formula rate plan extension request sharing mechanism customers																																							60.00%
Formula rate plan extension request MISO Only scenario common equity basis point range																																							75.00%
Formula rate plan extension request MISO Only scenario midpoint return on common equity																																							10.40%
Formula rate plan extension request MISO Only scenario revenue increase authorization																																							$ 24,000,000
Approved Recovery Through Rider Revenues																						$ 65,000,000
Adjustment to rider revenue requirement required if earnings exceed stated rate																						10.45%
Range of Adherence to a Specified Spending Plan																						20.00%
Actual Versus Planned Rider Spending Variance																						10.00%
Rate increase																						$ 706,000								$ 1,500,000
Authorized return on common equity																						7.20%
Rate increase value to reflect special formula rate plan rate implementation adjustment																							5,800,000
Estimated Revenue Requirement Implemented for Ninemile 6																							$ 26,800,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies																																									42,000,000
Class A preferred membership units sold to third party | shares																																														500,000
Proceeds From Sale of Preferred Membership Units																																														$ 51,000,000
Charges Above Prevailing Market Prices																																																										$ 57,000,000
Low Damages Range In Texas Lawsuit																																																										153,000,000
High Damages Range in Texas Lawsuit																																																										$ 972,000,000
Recommended adjustment to earned return on equity																				7.24%
Net increase in revenues per joint stipulation entered into with MPSC																				$ 688,000
Expected Base Purchase Price Union Power Station Power Block																						$ 237,000,000
LPSC staff recommended fuel adjustment clause refund including interest				5,000,000
Amount of LPSC Recommended Realignment of Fuel Cost Recovery to Base Rates											12,700,000
Entergy Gulf States Louisiana [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Bond issued by LCDA																																																																						$ 278,400,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																																																				$ 87,000,000
Amount Transferred to Entergy Louisiana																																																				187,700,000
Proceed from loan by LCDA to corporation LURC																																																				274,700,000
Amount used to acquire membership interest units in wholly owned Subsidiary																																																				$ 189,400,000
Class preferred, non-voting, membership interest units | shares																																																				1,893,918.39
Annual distribution rate																																																				10.00%
Liquidation price per unit | $ / unit																																																				100
Net worth required under terms of membership interest																																																				$ 1,000,000,000
Amount withdrawn from restricted escrow account as approved by units of wholly owned subsidiary																																																				$ 1,700,000
Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																																													27 years
Payments to Acquire Other Property, Plant, and Equipment																																																													$ (237,335,000)	0	0
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased																							20.00%
Amount included in electric rates per year to fund the smart energy efficiency programs as per rate case settlement																																																																$ 3,100,000
Energy Smart Program Costs																						1,200,000											$ 3,500,000
Energy Smart 2 Project Costs																						12,800,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies																																									$ 4,000,000
Financing order authorized to issue storm cost recovery bonds																			98,700,000
Amount of Hurricane Issac storm cost to be recovered through securitization																			31,800,000
Replenishment amount for storm reserve spending																			63,900,000
Other Regulatory Assets			268,106,000											265,322,000																																													265,322,000		268,106,000	265,322,000
Amount authorized for storm reserve																						75,000,000
Operation and maintenance expense																																																													117,471,000	119,087,000	131,549,000
Income before income taxes																																																													77,554,000	70,115,000	44,480,000
Deferred Fuel Cost			4,818,000											0																																													0		4,818,000	0
Purchase price of net assets that support Algiers customers																85,000,000
Repayment of long-term payable due to Entergy Louisiana																																																													(4,973,000)	(59,610,000)	0
Payable due Entergy Louisiana														25,500,000																																													25,500,000			25,500,000
Hurricane Isaac Storm Restoration Costs Approved as Recoverable from Electric Customers																						31,700,000
CIty Council authorized cap to fuel adjustment charge billed to customer																																																													0.035
Expected Base Purchase Price Union Power Station Power Block																	$ 237,000,000
Authorized monthly customer credits															$ 400,000
Payments to Acquire Property, Plant, and Equipment											237,000,000
Monthly customer credits							$ 1,400,000
Up Front Financing Costs On Issuance Of Bonds To Recover Storm Damage Restoration Costs																			3,000,000
Estimated Net benefit to Customers Anticipated with AMI Deployment					$ 101,000,000
Book Value of Existing Meters to be Retired with AMI Deployment														21,000,000																																													21,000,000			21,000,000
Proposed annual customer credits							5,000,000
Redemption of Preferred Equity							21,000,000
Call Premium on Preferred Stock							819,000
Entergy Texas [Member]
Rate and Regulatory Matters [Abstract]
Under-recovered fuel balance																														$ 8,700,000
System Agreement Bandwidth Remedy Payments																		$ 10,900,000								15,300,000
Request filed for refund of fuel cost recovery over collections																										$ 24,600,000
Earned return on common equity																														9.80%	9.20%			10.40%								10.60%			9.60%
Requested increase in retail revenues per request for annual distribution cost recovery factor rider																6,500,000									$ 7,000,000
Approved Recovery Through Rider Revenues															8.65								$ 3,600,000
Rate Case Filing Request To Reconcile Fuel and Purchased Power Costs and Fuel Revenues																																		$ 900,000,000
Rate Case Filing Request Special Circumstances Fuel Cost Recovery Of Purchased Power Costs																																		22,000,000
Rate reduction																															$ 300,000
Rate increase																														$ 18,500,000				38,600,000									$ 28,000,000																	$ 18,500,000
Increase In Base Rate Reflecting Return On Common Equity																																															$ 112,000,000
Asset Write-Offs, Impairments, And Related Charges																																																													0	23,472,000	0
After-Tax Asset Impairment Charge																																																														15,300,000
Refund To Customers								$ 68,000,000		56,200,000
Earned return on common equity																																											9.80%
Recommended Increase in Rate Base																																													$ 66,000,000
Revised Increase In Rate Base Request																																													$ 105,000,000
Amount Collected From Customers						29,500,000										10,100,000
MISO transition expenses in base rates per PUCT																																											$ 1,600,000
Reduction of fuel reconciliation recovery due to disagreement with line loss factor in calculation per PUCT																																											4,000,000
Regulatory charge recorded due to probability of non-recovery per PUCT order																																											$ 24,000,000
Other Regulatory Assets			740,156,000											$ 812,862,000																																													812,862,000		740,156,000	812,862,000
Operation and maintenance expense																																																													220,566,000	254,731,000	232,955,000
Income before income taxes																																																													$ 170,635,000	106,875,000	124,448,000
Public Utilities, Requested Rate Increase (Decrease), Amount																13,000,000
System Agreement Bandwidth Remedy Receipts																													$ 48,600,000
Reduction in approved retail rate increase															2,000,000
Intervenor Recommended Disallowance Due to Load Growth Adjustment															$ 3,400,000
Refund for fuel cost recovery										41,800,000
System Agreement Bandwidth Refund Related to Calendar Year 2006-2008 Production Costs										$ 3,500,000
Jurisdictional eligible fuel and purchased power expenses, net of credits																																																																			$ 1,770,000,000
Estimated deferred fuel over recovery balance for reconciliation period							19,300,000
Unspecific disallowance associated with settlement agreement			6,000,000
Projected Over-Recovery Balance				$ 21,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount																13,000,000
Public Utilities, Approved Rate Increase (Decrease), Amount							10,500,000
Authorized collection through TCRF rider			29,500,000			10,500,000
Entergy Texas [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Financing order authorized to issue storm cost recovery bonds																																																							$ 353,000,000
Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Period in which deferred cost balance is paid																																																													7 months
Period in which costs are collected from customer																																																													12 months
Redetermination Of Production Cost Allocation Rider Unrecovered Retail Balance									1,900,000																				3,000,000
System Agreement Bandwidth Remedy Payments																			$ 38,000,000										$ 67,800,000
Production Cost Allocation Rider Under-recovered Retail Balance Approved for Recovery																						3,000,000
System Agreement Bandwidth Remedy Payments Approved for Recovery									$ 1,900,000													67,800,000
Energy Cost Recovery Rider, Energy Cost Rate, Costs and Expected Sales, Period																																																													12 months
Number of Outages | outage																																																																	2
Response Period For Analysis to Determine Additional Fuel and Purchased Energy Costs																																																								60 days
Incremental Fuel and Replacement Energy Costs																															$ 65,900,000
Amortization period of cost																																																													27 years
Payments to Acquire Other Property, Plant, and Equipment																																																													$ (237,323,000)	0	0
APSC filing requested rate increase transition to MISO scenario																																		$ 145,000,000				$ 174,000,000
APSC filing requested revenue transfer from collection in riders to base rates MISO scenario																																						$ 49,000,000
Earned return on common equity														9.75%						10.20%												9.30%		10.40%				10.40%
Public Utilities, Approved Return on Equity, Percentage																										9.50%					9.30%
APSC Filing Authorized Rate Increase Transition to MISO Scenario																																$ 81,000,000
Basis Point Bandwidth														50.00%
Rate increase														$ 225,000,000						$ 268,400,000
Amount Collected From Customers																																														$ 156,000,000
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills																																					$ 2,300,000
Reduction In Amount Of Damages That Should Be Paid By Entergy Arkansas To Utility Operating Companies																																			20.00%
Other Regulatory Assets			1,428,029,000											1,333,773,000																																													1,333,773,000		1,428,029,000	1,333,773,000
Operation and maintenance expense																																																													706,573,000	734,118,000	647,461,000
Income before income taxes																																																													274,985,000	114,813,000	205,021,000
Deferred Fuel Cost			96,690,000											0																																													0		96,690,000	0
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 67,700,000
Production Cost Allocation Rider Adjustment Collection Period																																														22 months
Approved Total Hurricane Isaac Storm Restoration Costs																						$ 49,300,000
Net increase in revenues per joint stipulation entered into with MPSC														133,000,000						$ 167,000,000
APSC and Intervener Recommended Revenue Requirement																$ 217,900,000
APSC and Intervener Recommended Return on Equity																9.65%
Up Front Financing Costs On Issuance Of Bonds To Recover Storm Damage Restoration Costs																																																		$ 4,600,000
Reduction in approved retail rate increase												$ 5,000,000
Post-Fukushima Compliance Costs														7,700,000
Flood Barrier Compliance Costs														9,900,000
Interim Base Rate Adjustment Surcharge Recovery											21,100,000
Public Utilities, Requested Return on Equity, Percentage							9.75%
Public Utilities, Requested Increase in Revenue Requirement					$ 54,400,000
Portion of Approved Revenue Requirement Increase Subject to Possible Future Adjustment and Refund to Customers			25,000,000
Estimated Net benefit to Customers Anticipated with AMI Deployment						$ 431,000,000
Book Value of Existing Meters to be Retired with AMI Deployment														57,000,000																																													57,000,000			57,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 67,700,000
ALJ Recommended Percentage By Which Payments Be Reduced										20.00%
Liability Recorded Related to Estimated Payments Due Utility Operating Companies											87,000,000																																																								87,000,000
Regulatory Asset Recorded to Represent Estimate of Recoverable Retail Portion of Costs											$ 75,000,000																																																								$ 75,000,000
System Energy [Member]
Rate and Regulatory Matters [Abstract]
Payments from utility operating companies as percentage of average production cost																																																									11.00%
Other Regulatory Assets			411,212,000											347,830,000																																													347,830,000		411,212,000	347,830,000
Operation and maintenance expense																																																													153,064,000	156,552,000	156,502,000
Income before income taxes																																																													167,805,000	164,395,000	$ 179,644,000
Entergy Holdings Company LLC [Member]
Rate and Regulatory Matters [Abstract]
Class preferred, non-voting, membership interest units | shares																										2,935,152.69
Annual distribution rate																										7.50%
Liquidation price per unit | $ / unit																										100
Net worth required under terms of membership interest																										$ 1,750,000,000
Gas [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity													10.22%
Gas [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity																															5.47%
Rate increase																															$ 1,500,000
Electric [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Formula Rate Plan Period																																3 years
Formula Rate Plan Extension Approved MISO Only Scenario Midpoint Return On Common Equity																																9.95%
Formula Rate Plan Extension Approved MISO Only Scenario Common Equity Basis Point Range																																80.00%
Formula Rate Plan Extension Approved Sharing Mechanism Customers																																60.00%
Formula Rate Plan Extension Approved Sharing Mechanism Company																																40.00%
Cumulative Cap on Cost of Service Increases																																$ 30,000,000
Rate increase																																$ 10,000,000
Electric [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Formula Rate Plan Period																																3 years
Formula Rate Plan Extension Approved MISO Only Scenario Midpoint Return On Common Equity																																9.95%
Formula Rate Plan Extension Approved MISO Only Scenario Common Equity Basis Point Range																																80.00%
Formula Rate Plan Extension Approved Sharing Mechanism Customers																																60.00%
Formula Rate Plan Extension Approved Sharing Mechanism Company																																40.00%
Human Capital Management Costs [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets			17,300,000											28,300,000																																													28,300,000		17,300,000	28,300,000
Human Capital Management Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets			10,000,000											17,600,000																																													17,600,000		10,000,000	17,600,000
Human Capital Management Costs [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[1]		7,000,000											10,400,000																																													10,400,000		7,000,000	10,400,000
Human Capital Management Costs [Member] | Electric [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																3 years
Human Capital Management Costs [Member] | Electric [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																3 years
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Asset, Noncurrent, Amortization Period																																							8 years
Other Regulatory Assets	[1]		43,100,000											50,400,000																																													50,400,000		43,100,000	50,400,000
Nuclear Generation Development Costs [Member] | Electric [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																8 years
Nuclear Generation Development Costs [Member] | Electric [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																8 years
Asset Retirement Obligation Costs [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]		677,200,000											589,100,000																																													589,100,000		677,200,000	589,100,000
Asset Retirement Obligation Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]		199,400,000											180,800,000																																													180,800,000		199,400,000	180,800,000
Asset Retirement Obligation Costs [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]		7,200,000											6,700,000																																													6,700,000		7,200,000	6,700,000
Asset Retirement Obligation Costs [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]		4,200,000											4,000,000																																													4,000,000		4,200,000	4,000,000
Asset Retirement Obligation Costs [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]		322,900,000											288,000,000																																													288,000,000		322,900,000	288,000,000
Asset Retirement Obligation Costs [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]		$ 142,500,000											$ 108,600,000																																													$ 108,600,000		$ 142,500,000	$ 108,600,000
Subsequent Event [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity		10.94%
Subsequent Event [Member] | Minimum [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Recommended adjustment to earned return on equity		8.37%
Subsequent Event [Member] | Maximum [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Recommended adjustment to earned return on equity		8.67%
Subsequent Event [Member] | Gas [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity		6.37%
Requested Recovery of Previously Deferred Operation and Maintenance Expenses		$ 1,500,000
Public Utilities, Requested Increase in Revenue Requirement		$ 1,400,000

[1] Does not earn a return on investment.

[2] Does not earn a return on investment, but is offset by related liabilities.