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	Sep. 30, 2020	Dec. 31, 2019
Long-term Debt, Fair Value	$ 22,925,661	$ 19,059,950
Long-term Debt, Book Value	20,662,679	17,873,655
Entergy Arkansas [Member]
Long-term Debt, Fair Value	4,648,483	3,747,914
Long-term Debt, Book Value	4,280,229	3,517,208
Entergy Louisiana [Member]
Long-term Debt, Fair Value	8,756,480	7,961,168
Long-term Debt, Book Value	7,651,976	7,303,669
Entergy Mississippi [Member]
Long-term Debt, Fair Value	1,997,431	1,709,505
Long-term Debt, Book Value	1,780,310	1,614,129
Entergy New Orleans [Member]
Long-term Debt, Fair Value	663,388	523,846
Long-term Debt, Book Value	674,832	560,906
Entergy Texas [Member]
Long-term Debt, Fair Value	2,318,713	2,090,215
Long-term Debt, Book Value	2,047,749	1,922,956
System Energy [Member]
Long-term Debt, Fair Value	615,602	565,209
Long-term Debt, Book Value	$ 592,611	$ 548,107