Income Taxes Income Taxes (Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Apr. 01, 2023
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	$ 0	$ 17,000,000
Entergy Arkansas [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	$ 0
State Effective Income tax Rate, Percent	5.30%
Entergy Arkansas [Member] | Subsequent Event [Member]
State Effective Income tax Rate, Percent			5.10%
Entergy Louisiana [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	$ 0	9,000,000
Regulatory charge recorded as a result of reduction in income tax expense	103,000,000
Regulatory charge recorded as a result of reduction in income tax expense, net of tax	76,000,000
Reduction to income tax expense - net of provision for uncertain tax positions	133,000,000
Reduction to income tax expense - net, offset by other tax charges	129,000,000
Entergy Mississippi [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	0
Entergy New Orleans [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	0	1,000,000
Entergy Texas [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	0	$ 7,000,000
System Energy [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes	$ 0