Business Segment Information (Narrative) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2013 position	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Restructuring costs incurred, pre-tax		$ 20	$ 110
Restructuring costs incurred, net of tax		12	70
Number of employee positions eliminated | position	800
Utility Plants [Member]
Segment Reporting Information [Line Items]
Restructuring costs incurred, pre-tax		15	85
Restructuring costs incurred, net of tax		9	55
Entergy Wholesale Commodities [Member]
Segment Reporting Information [Line Items]
Restructuring costs incurred, pre-tax		5	25
Restructuring costs incurred, net of tax		$ 3	$ 15