Risk Management and Fair Values (Narrative) (Details) $ in Thousands	Sep. 30, 2025 USD ($) GWh MMBTU	Dec. 31, 2024 USD ($)
Cash	$ 82,709	$ 48,424
Entergy Arkansas [Member]
Cash	11,314	1,306
Entergy Louisiana [Member]
Cash	1,681	327
Entergy Mississippi [Member]
Cash	687	184
Entergy New Orleans [Member]
Cash	223	374
Entergy Texas [Member]
Cash	789	291
System Energy [Member]
Cash	$ 457	448
Natural Gas Swaps
Derivative, Remaining Maturity	6 months
Total volume outstanding | MMBTU	10,249,700
Natural Gas Swaps | Entergy Louisiana [Member]
Total volume outstanding | MMBTU	0
Natural Gas Swaps | Entergy Mississippi [Member]
Derivative, Remaining Maturity	6 months
Total volume outstanding | MMBTU	10,249,700
Financial transmission rights
Letters of Credit Outstanding, Amount	$ 4,000	2,000
Total volume outstanding | GWh	72,481
Financial transmission rights | Corporate Segment and Other Operating Segment [Member]
Letters of Credit Outstanding, Amount	$ 0
Cash	0
Financial transmission rights | Entergy Arkansas [Member]
Letters of Credit Outstanding, Amount	$ 2,100	500
Total volume outstanding | GWh	15,442
Financial transmission rights | Entergy Louisiana [Member]
Letters of Credit Outstanding, Amount	$ 500	100
Total volume outstanding | GWh	38,388
Financial transmission rights | Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount	$ 1,200	800
Total volume outstanding | GWh	8,133
Financial transmission rights | Entergy New Orleans [Member]
Letters of Credit Outstanding, Amount		100
Total volume outstanding | GWh	2,634
Financial transmission rights | Entergy Texas [Member]
Letters of Credit Outstanding, Amount		$ 300
Total volume outstanding | GWh	7,884