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, 2021	Dec. 31, 2020
Long-term Debt, Fair Value	$ 25,716,967	$ 24,813,818
Long-term Debt, Book Value	24,704,475	22,369,776
Entergy Arkansas [Member]
Long-term Debt, Fair Value	4,126,514	4,355,632
Long-term Debt, Book Value	3,958,751	3,967,507
Entergy Louisiana [Member]
Long-term Debt, Fair Value	10,681,713	10,258,294
Long-term Debt, Book Value	10,059,885	9,027,451
Entergy Mississippi [Member]
Long-term Debt, Fair Value	2,084,891	2,021,432
Long-term Debt, Book Value	1,981,429	1,780,577
Entergy New Orleans [Member]
Long-term Debt, Fair Value	584,475	620,634
Long-term Debt, Book Value	642,412	642,233
Entergy Texas [Member]
Long-term Debt, Fair Value	2,545,973	2,765,193
Long-term Debt, Book Value	2,465,827	2,493,708
System Energy [Member]
Long-term Debt, Fair Value	785,758	840,540
Long-term Debt, Book Value	$ 768,969	$ 805,274