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, 2020	Dec. 31, 2019
Long-term Debt, Fair Value	$ 20,426,604	$ 19,059,950
Long-term Debt, Book Value	19,458,543	17,873,655
Entergy Arkansas [Member]
Long-term Debt, Fair Value	3,831,058	3,747,914
Long-term Debt, Book Value	3,655,723	3,517,208
Entergy Louisiana [Member]
Long-term Debt, Fair Value	8,496,243	7,961,168
Long-term Debt, Book Value	7,923,381	7,303,669
Entergy Mississippi [Member]
Long-term Debt, Fair Value	1,692,495	1,709,505
Long-term Debt, Book Value	1,614,156	1,614,129
Entergy New Orleans [Member]
Long-term Debt, Fair Value	652,690	523,846
Long-term Debt, Book Value	680,188	560,906
Entergy Texas [Member]
Long-term Debt, Fair Value	2,239,980	2,090,215
Long-term Debt, Book Value	2,091,130	1,922,956
System Energy [Member]
Long-term Debt, Fair Value	615,747	565,209
Long-term Debt, Book Value	$ 604,925	$ 548,107