Rate And Regulatory Matters (Utility Operating Companies' Current Retail Base Rates) (Details)	12 Months Ended	1 Months Ended				12 Months Ended
	Dec. 31, 2012 Entergy Arkansas [Member]	Dec. 31, 2012 Entergy Gulf States Louisiana [Member]	Nov. 30, 2012 Entergy Gulf States Louisiana [Member]	Apr. 30, 2012 Entergy Gulf States Louisiana [Member]	Jan. 31, 2012 Entergy Gulf States Louisiana [Member]	Dec. 31, 2012 Entergy Texas [Member]	Dec. 31, 2012 Minimum [Member] Entergy Gulf States Louisiana [Member]	Dec. 31, 2012 Maximum [Member] Entergy Gulf States Louisiana [Member]
Regulatory Assets [Line Items]
Authorized return on common equity	10.20%	9.40%	10.50%	11.54%	10.48%	10.125%	9.90%	11.40%