Income Taxes Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Regulatory Liability, Noncurrent	$ 1,433,632	$ 1,414,898
Entergy Arkansas [Member]
Regulatory Liability, Noncurrent	257,879	242,913
Entergy Louisiana [Member]
Regulatory Liability, Noncurrent	817,625	818,623
System Energy [Member]
Regulatory Liability, Noncurrent	$ 344,950	$ 337,424