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, 2020	Dec. 31, 2019
Long-term Debt, Fair Value	$ 21,651,678	$ 19,059,950
Long-term Debt, Book Value	19,483,373	17,873,655
Entergy Arkansas [Member]
Long-term Debt, Fair Value	3,972,000	3,747,914
Long-term Debt, Book Value	3,628,588	3,517,208
Entergy Louisiana [Member]
Long-term Debt, Fair Value	8,988,369	7,961,168
Long-term Debt, Book Value	7,879,741	7,303,669
Entergy Mississippi [Member]
Long-term Debt, Fair Value	1,964,145	1,709,505
Long-term Debt, Book Value	1,780,040	1,614,129
Entergy New Orleans [Member]
Long-term Debt, Fair Value	658,162	523,846
Long-term Debt, Book Value	674,617	560,906
Entergy Texas [Member]
Long-term Debt, Fair Value	2,328,356	2,090,215
Long-term Debt, Book Value	2,070,503	1,922,956
System Energy [Member]
Long-term Debt, Fair Value	621,692	565,209
Long-term Debt, Book Value	$ 596,861	$ 548,107