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, 2021	Dec. 31, 2020
Long-term Debt, Fair Value	$ 26,221,663	$ 24,813,818
Long-term Debt, Book Value	24,497,290	22,369,776
Entergy Arkansas [Member]
Long-term Debt, Fair Value	4,327,356	4,355,632
Long-term Debt, Book Value	4,043,714	3,967,507
Entergy Louisiana [Member]
Long-term Debt, Fair Value	10,746,564	10,258,294
Long-term Debt, Book Value	9,836,133	9,027,451
Entergy Mississippi [Member]
Long-term Debt, Fair Value	2,166,517	2,021,432
Long-term Debt, Book Value	1,981,674	1,780,577
Entergy New Orleans [Member]
Long-term Debt, Fair Value	584,209	620,634
Long-term Debt, Book Value	636,870	642,233
Entergy Texas [Member]
Long-term Debt, Fair Value	2,496,970	2,765,193
Long-term Debt, Book Value	2,323,879	2,493,708
System Energy [Member]
Long-term Debt, Fair Value	771,477	840,540
Long-term Debt, Book Value	$ 750,939	$ 805,274