Business Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2013 position	Dec. 31, 2012 subsidiary	Dec. 31, 2013 plant
Segment Reporting Information [Line Items]
Number of nuclear power plants			6
Number of subsidiaries transferred between segments		2
Restructuring costs incurred, pre-tax			$ 110
Restructuring costs incurred, net of tax			70
Number of employee positions eliminated	800
Utility Plants [Member]
Segment Reporting Information [Line Items]
Restructuring costs incurred, pre-tax			85
Restructuring costs incurred, net of tax			55
Entergy Wholesale Commodities [Member]
Segment Reporting Information [Line Items]
Restructuring costs incurred, pre-tax			25
Restructuring costs incurred, net of tax			$ 15