Rate And Regulatory Matters (Narrative) (Details) (USD $)	1 Months Ended
	Apr. 30, 2013	Mar. 31, 2013	Jan. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Aug. 31, 2012	May 31, 2012
Entergy Louisiana [Member]
Commitments and Contingencies [Abstract]
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies				$ 7,000,000
Requested replenishment of storm escrow accounts - Hurricane Isaac	200,000,000
Requested recovery of system restoration costs - Hurricane Isaac	247,700,000
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
Rate Change Contribution To Entergy Louisianas 2012 Revenues					5,300,000
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%
Public Utilities Earned Return On Common Equity		10.40%				10.38%
Rate Increase		13,000,000
Rate Increase for Incremental Capacity Costs						15,900,000	18,100,000
Withdrawal From Funded Storm Reserve			187,000,000
Entergy Mississippi [Member]
Commitments and Contingencies [Abstract]
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies				23,000,000
Public Utilities Earned Return On Common Equity		10.55%
Electric Base Revenue Increase		36,300,000
Entergy Gulf States Louisiana [Member]
Commitments and Contingencies [Abstract]
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies				42,000,000
Requested replenishment of storm escrow accounts - Hurricane Isaac	90,000,000
Requested recovery of system restoration costs - Hurricane Isaac	73,800,000
Expected retail jurisdictional cost				16,900,000
Public Utilities Earned Return On Common Equity			11.18%			11.86%	11.94%
Rate reduction			43,000
Cost of Service Rate Change						5,700,000	6,500,000
Rate Decrease for Incremental Capacity Costs						20,300,000	22,900,000
Rate Increase for Incremental Capacity Costs	7,300,000
Increase in revenues as a result of rate change					8,700,000
Withdrawal From Funded Storm Reserve			65,000,000
Entergy New Orleans
Commitments and Contingencies [Abstract]
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies				4,000,000
Entergy Arkansas [Member]
Commitments and Contingencies [Abstract]
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills	2,300,000			12,000,000
Amount Entegy Arkansas Shareholders Should Pay Customers				34,000,000
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