Income Taxes Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2020
Income Tax Reconciliation Flow Through Permanent Differences	$ 24.7
Increase (Reduction) in income tax resulting from Act 55 financing settlement	32.0
Act 55 final recorded income tax reduction	58.0
Increase (Decrease) in Income Taxes	26.0
Subsequent Event [Member]
CARES Act Deferred Tax Expense			$ 64.0
CARES Act annual payroll tax installment due resulting from deferred tax payments		$ 32.0
Entergy Arkansas [Member]
Income Tax Reconciliation Flow Through Permanent Differences	4.8
Entergy Louisiana [Member]
Income Tax Reconciliation Flow Through Permanent Differences	8.6
Regulatory Charge for Hurricane Isaac Act 55 Tax Obligation to Customers	29.0
Regulatory Charge for Hurricane Isaac Act 55 Tax Obligation to Customers (Net-of-tax)	21.0
Entergy Mississippi [Member]
Income Tax Reconciliation Flow Through Permanent Differences	2.7
Entergy New Orleans [Member]
Income Tax Reconciliation Flow Through Permanent Differences	1.5
System Energy [Member]
Income Tax Reconciliation Flow Through Permanent Differences	1.3
Entergy Texas [Member]
Income Tax Reconciliation Flow Through Permanent Differences	$ 2.7