Risk Management and Fair Values (Narrative) (Details) TWh in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) GWh MMBTU	Jun. 30, 2020 USD ($)	Dec. 31, 2021 TWh	Jun. 30, 2021 USD ($) GWh MMBTU	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Maturity of cash flow hedges, Tax		$ 5.0		$ 8.0	$ 25.0
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	33,969,600			33,969,600
Total volume of fixed transmission rights outstanding | GWh	126,149			126,149
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset and Liability Unrealized Gains (Loss) Included in Earnings		3.0			4.0
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0.2			$ 0.2		$ 0.1
Letters Of Credit	6.0			6.0
Entergy Arkansas [Member]
Letters of Credit Outstanding, Amount	$ 1.5			$ 1.5
Total volume of fixed transmission rights outstanding | GWh	25,505			25,505
Entergy Louisiana [Member]
Letters of Credit Outstanding, Amount	$ 0.7			$ 0.7		0.3
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	20,100,000			20,100,000
Total volume of fixed transmission rights outstanding | GWh	58,280			58,280
Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount	$ 0.9			$ 0.9		0.2
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	13,569,000			13,569,000
Total volume of fixed transmission rights outstanding | GWh	14,634			14,634
Entergy New Orleans [Member]
Letters of Credit Outstanding, Amount	$ 0.3			$ 0.3		0.2
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	300,600			300,600
Total volume of fixed transmission rights outstanding | GWh	5,842			5,842
Entergy Texas [Member]
Letters of Credit Outstanding, Amount	$ 2.3			$ 2.3		0.5
Total volume of fixed transmission rights outstanding | GWh	21,399			21,399
Gas Hedge Contracts [Member] | Entergy Louisiana [Member]
Maximum Length of Time Hedged in Cash Flow Hedge				2 years 9 months
Gas Hedge Contracts [Member] | Entergy Mississippi [Member]
Maximum Length of Time Hedged in Cash Flow Hedge				9 months
Gas Hedge Contracts [Member] | Entergy New Orleans [Member]
Maximum Length of Time Hedged in Cash Flow Hedge				9 months
Electricity Swaps And Options [Member] | Cash Flow Hedging [Member] | Competitive Businesses Operating Revenues [Member]
Maturity of cash flow hedges, before taxes	$ 0.0	$ 25.0		$ 40.0	$ 120.0
Entergy Wholesale Commodities [Member]
Cash collateral posted	5.0			5.0		5.0
Letters of Credit Held						39.0
Utility [Member]
Letters Of Credit	$ 6.0			$ 6.0		$ 1.0
Subsequent Event [Member]
Planned generation sold forward from non utility nuclear power plants for the remainder of the period			98.00%
Total planned generation for remainder of the period | TWh			3.4