Leases (Future Minimum Lease Payments Sale Leaseback Transactions) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
System Energy [Member] | Grand Gulf [Member]
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months	$ 17,188
Year Two	17,188
Year Three	17,188
Year Four	17,188
Year Five	17,188
Years thereafter	257,812
Total	343,752
Less: Amount representing interest	309,393
Present value of net minimum lease payments	34,359
Entergy Louisiana [Member] | Waterford 3 [Member]
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months	57,500
Less: Amount representing interest	$ 2,300