Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Book Value And The Fair Value Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long-term Debt, Fair Value	$ 15,521,205	$ 15,367,453
Long-term Debt, Book Value	15,874,594	15,075,266
Entergy Arkansas [Member]
Long-term Debt, Fair Value	2,991,503	2,865,844
Long-term Debt, Book Value	3,212,424	2,952,399
Long term DOE obligations	185,000	183,000
Entergy Louisiana [Member]
Long-term Debt, Fair Value	6,406,225	6,389,774
Long-term Debt, Book Value	6,491,723	6,144,071
Entergy Mississippi [Member]
Long-term Debt, Fair Value	1,240,643	1,285,741
Long-term Debt, Book Value	1,270,559	1,270,122
Entergy New Orleans [Member]
Long-term Debt, Fair Value	441,342	455,968
Long-term Debt, Book Value	431,795	436,870
Entergy Texas [Member]
Long-term Debt, Fair Value	1,581,882	1,661,902
Long-term Debt, Book Value	1,548,180	1,587,150
System Energy [Member]
Long-term Debt, Fair Value	571,461	529,119
Long-term Debt, Book Value	601,662	551,488
Capital Lease Obligations	$ 34,000	$ 34,000