Revenue Recognition Revenue Recognition (Narrative) (Details) $ in Millions	5 Months Ended	12 Months Ended			29 Months Ended	180 Months Ended	185 Months Ended
	May 31, 2022 $ / MWh	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 31, 2022 $ / MWh	Dec. 31, 2021 $ / MWh	May 31, 2022 $ / MWh
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		$ 38.7	$ 40.6
COVID-19 Pandemic [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)			(6.4)
System Energy [Member]
Percent Interest in Grand Gulf		90.00%
Entergy Louisiana [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		$ 13.9	10.7
Entergy Louisiana [Member] | COVID-19 Pandemic [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)			(8.5)
Entergy Mississippi [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		7.3	3.2
Entergy Texas [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		4.7	4.1
Entergy Texas [Member] | COVID-19 Pandemic [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)			(1.3)
Entergy New Orleans [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		3.4	7.7
Entergy New Orleans [Member] | COVID-19 Pandemic [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)			(3.0)
Entergy Arkansas [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)		$ 9.4	14.9
Entergy Arkansas [Member] | COVID-19 Pandemic [Member]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)			6.4
Corporate and Other [Member] | Palisades [Member]
Average Price Under PPA | $ / MWh							51
Amortization of Intangible Assets			$ 5.0	$ 12.0
Contract price under purchase power agreement | $ / MWh	61.50				24.14	43.50