Business Segment Information Business Segment Information (Restructuring Costs) (Details) - Entergy Wholesale Commodities [Member] $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 95.5
Paid in cash	0.9
Non-cash portion	3.1
Restructuring Reserve	91.5
Employee Retention and Severances Expenses and Other Benefits-Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	74.2
Paid in cash	0.9
Non-cash portion	3.1
Restructuring Reserve	70.2
Economic Development Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	21.3
Paid in cash	0.0
Non-cash portion	0.0
Restructuring Reserve	$ 21.3