Income Taxes Income Taxes (Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes		$ 16	$ 14	$ 33	$ 54
Reduction of income tax expense	$ 283
Entergy Arkansas [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes		0	0	0	8
Entergy Louisiana [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes		9	8	18	15
Reduction of income tax expense	290
Regulatory charge recorded as a result of reduction in income tax expense	224
Regulatory charge recorded as a result of reduction in income tax expense, net of tax	$ 165
Entergy New Orleans [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes		0	0	1	0
Entergy Texas [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes		7	6	14	13
System Energy [Member]
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes		$ 0	$ 0	$ 0	$ 18