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	Mar. 31, 2018	Dec. 31, 2017
Long-term Debt, Fair Value	$ 16,771,585	$ 15,367,453
Long-term Debt, Book Value	16,851,636	15,075,266
Entergy Arkansas [Member]
Long-term Debt, Fair Value	2,812,019	2,865,844
Long-term Debt, Book Value	2,978,569	2,952,399
Long term DOE obligations	184,000	183,000
Entergy Louisiana [Member]
Long-term Debt, Fair Value	7,022,323	6,389,774
Long-term Debt, Book Value	6,938,439	6,144,071
Entergy Mississippi [Member]
Long-term Debt, Fair Value	1,252,877	1,285,741
Long-term Debt, Book Value	1,270,399	1,270,122
Entergy New Orleans [Member]
Long-term Debt, Fair Value	446,981	455,968
Long-term Debt, Book Value	436,995	436,870
Entergy Texas [Member]
Long-term Debt, Fair Value	1,603,892	1,661,902
Long-term Debt, Book Value	1,562,555	1,587,150
System Energy [Member]
Long-term Debt, Fair Value	576,121	529,119
Long-term Debt, Book Value	601,582	551,488
Capital Lease Obligations	$ 34,000	$ 34,000