Risk Management and Fair Values (Narrative) (Details) TWh in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2021 TWh	Sep. 30, 2021 USD ($) GWh MMBTU	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) GWh MMBTU	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Maturity of cash flow hedges, Tax			$ 3.0	$ 8.0	$ 28.0
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		30,980,500		30,980,500
Total volume of fixed transmission rights outstanding | GWh		91,873		91,873
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset and Liability Unrealized Gains (Loss) Included in Earnings			(3.7)		(0.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss		$ 0.3		$ 0.3		$ 0.1
Letters Of Credit		6.0		6.0
Entergy Arkansas [Member]
Letters of Credit Outstanding, Amount		$ 1.0		$ 1.0
Total volume of fixed transmission rights outstanding | GWh		19,386		19,386
Entergy Louisiana [Member]
Letters of Credit Outstanding, Amount		$ 1.5		$ 1.5		0.3
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		18,260,000		18,260,000
Total volume of fixed transmission rights outstanding | GWh		41,531		41,531
Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount		$ 0.7		$ 0.7		0.2
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		11,438,000		11,438,000
Total volume of fixed transmission rights outstanding | GWh		10,505		10,505
Entergy New Orleans [Member]
Letters of Credit Outstanding, Amount		$ 0.3		$ 0.3		0.2
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		1,282,500		1,282,500
Total volume of fixed transmission rights outstanding | GWh		4,242		4,242
Entergy Texas [Member]
Letters of Credit Outstanding, Amount		$ 0.8		$ 0.8		0.5
Total volume of fixed transmission rights outstanding | GWh		15,849		15,849
Gas Hedge Contracts [Member] | Entergy Louisiana [Member]
Maximum Length of Time Hedged in Cash Flow Hedge				2 years 6 months
Gas Hedge Contracts [Member] | Entergy Mississippi [Member]
Maximum Length of Time Hedged in Cash Flow Hedge				6 months
Gas Hedge Contracts [Member] | Entergy New Orleans [Member]
Maximum Length of Time Hedged in Cash Flow Hedge				6 months
Electricity Swaps And Options [Member] | Cash Flow Hedging [Member] | Competitive Businesses Operating Revenues [Member]
Maturity of cash flow hedges, before taxes		$ 0.0	$ 15.0	$ 40.0	$ 134.0
Entergy Wholesale Commodities [Member]
Cash collateral posted		6.0		6.0		5.0
Letters of Credit Held						39.0
Utility [Member]
Letters Of Credit		$ 4.0		$ 4.0		$ 1.0
Subsequent Event [Member]
Planned generation sold forward from non utility nuclear power plants for the remainder of the period	99.00%
Total planned generation for remainder of the period | TWh	1.7