Rate And Regulatory Matters (Narrative) (Details) (USD $)	1 Months Ended						0 Months Ended		1 Months Ended								0 Months Ended	1 Months Ended	3 Months Ended	4 Months Ended	1 Months Ended
	Apr. 30, 2013 Entergy Louisiana [Member]	Mar. 31, 2013 Entergy Louisiana [Member]	Jan. 31, 2013 Entergy Louisiana [Member]	Dec. 31, 2012 Entergy Louisiana [Member]	Aug. 31, 2012 Entergy Louisiana [Member]	May 31, 2012 Entergy Louisiana [Member]	Jul. 01, 2013 Entergy Mississippi [Member]	Jun. 06, 2013 Entergy Mississippi [Member]	Mar. 31, 2013 Entergy Mississippi [Member]	Dec. 31, 2012 Entergy Mississippi [Member]	May 31, 2013 Entergy Gulf States Louisiana [Member]	Apr. 30, 2013 Entergy Gulf States Louisiana [Member]	Jan. 31, 2013 Entergy Gulf States Louisiana [Member]	Dec. 31, 2012 Entergy Gulf States Louisiana [Member]	Aug. 31, 2012 Entergy Gulf States Louisiana [Member]	May 31, 2012 Entergy Gulf States Louisiana [Member]	Aug. 01, 2013 Entergy New Orleans	Dec. 31, 2012 Entergy New Orleans	Jun. 30, 2013 Entergy New Orleans	Dec. 31, 2013 Entergy New Orleans	Apr. 30, 2013 Entergy Arkansas [Member]	Mar. 31, 2013 Entergy Arkansas [Member]	Dec. 31, 2012 Entergy Arkansas [Member]
Commitments and Contingencies [Abstract]
Additional Provision Recorded For Refund To Customers																			$ 1,100,000
Refund To Customers																				6,000,000
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills																							12,000,000
Increase In Potential Costs For Entergy Arkansas For Years 2003, 2004, and 2006 Based On Intra-System Bill																					2,300,000
Amount Entegy Arkansas Shareholders Should Pay Customers																							34,000,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies				7,000,000						23,000,000				42,000,000				4,000,000
Requested replenishment of storm escrow accounts - Hurricane Isaac	200,000,000											90,000,000
Requested recovery of system restoration costs - Hurricane Isaac	247,700,000											73,800,000
Storm restoration costs incurred - Hurricane Isaac							32,000,000
Storm restoration costs incurred that are recoverable through the formula rate plan - Hurricane Isaac							700,000
Storm reserve accrual - Hurricane Isaac							750,000
Increase for first year retail revenue requirement associated with W3 replacement steam generator project				88,000,000
Reduction For First Year Capacity Charges For Purchase By Entergy Gulf States Louisiana From Entergy Louisiana for One Third Of Acadia Unit 2 Capacity And Energy				17,000,000
Expected retail jurisdictional cost														16,900,000
APSC filing requested return on common equity																						10.40%
APSC filing requested rate increase proposed spin merge of transmission business																						218,000,000
APSC filing requested revenue transfer from collection in riders to base rates MISO scenario																						49,000,000
APSC filing requested rate increase transition to MISO scenario																						174,000,000
Realignment of the recovery from Entergy Louisiana's fuel adjustment clause to base rates per LPSC January 2013 audit report			1,000,000
Refund to customers per LPSC Staff January 2013 audit report			1,900,000
Public Utilities Recommended Midpoint Return On Common Equity						9.63%					9.95%
Public Utilities Earned Return On Common Equity		10.40%			10.38%			10.59%	10.55%				11.18%		11.86%	11.94%
Rate reduction													43,000
Rate Increase		13,000,000
Cost Of Service Rate Decrease															5,700,000	6,500,000
Rate Decrease for Incremental Capacity Costs															20,300,000	22,900,000
Rate Increase for Incremental Capacity Costs					15,900,000	18,100,000						7,300,000
Electric Base Revenue Increase								22,300,000	36,300,000
Electric Base Revenue Decrease																	1,625,000
Increase in Annual Funding for Storm Reserve							1,750,000
Withdrawal From Funded Storm Reserve			$ 187,000,000										$ 65,000,000