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, 2021	Dec. 31, 2020
Long-term Debt, Fair Value	$ 26,151,363	$ 24,813,818
Long-term Debt, Book Value	24,617,004	22,369,776
Entergy Arkansas [Member]
Long-term Debt, Fair Value	4,211,956	4,355,632
Long-term Debt, Book Value	3,959,194	3,967,507
Entergy Louisiana [Member]
Long-term Debt, Fair Value	10,622,419	10,258,294
Long-term Debt, Book Value	9,813,493	9,027,451
Entergy Mississippi [Member]
Long-term Debt, Fair Value	2,154,281	2,021,432
Long-term Debt, Book Value	1,981,945	1,780,577
Entergy New Orleans [Member]
Long-term Debt, Fair Value	611,728	620,634
Long-term Debt, Book Value	662,079	642,233
Entergy Texas [Member]
Long-term Debt, Fair Value	2,510,669	2,765,193
Long-term Debt, Book Value	2,353,742	2,493,708
System Energy [Member]
Long-term Debt, Fair Value	762,981	840,540
Long-term Debt, Book Value	$ 745,772	$ 805,274