Quarterly Financial Data (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			1 Months Ended
	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Human Capital Management Strategic Initiative [Member]	Dec. 31, 2013 Human Capital Management Strategic Initiative [Member] Entergy Louisiana [Member]	Dec. 31, 2013 Human Capital Management Strategic Initiative [Member] Entergy Arkansas [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 355.5	$ 321.5	$ 355.5
After tax asset impairment charge	223.5	202.2	223.5
Restructuring costs incurred, pre-tax				110
Restructuring costs incurred, net of tax		70		70
Restructuring costs, deferred recovery, pre-tax					45	45
Restructuring costs, deferred recovery, net of tax					$ 30	$ 30