Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Entergy Wholesale Commodities [Member]
Derivatives, Fair Value [Line Items]
Cash collateral posted	$ 8.0	$ 8.0
Other Deferred Debits And Other Assets [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	8.0	5.0
Derivative Asset, Fair Value, Gross Asset	8.0	5.0
Derivative, Collateral, Obligation to Return Cash		0.0
Prepayments And Other [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	54.0	6.0
Derivative Asset, Fair Value, Gross Asset	54.0	6.0
Derivative, Collateral, Obligation to Return Cash	0.0	0.0
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	1.0	4.0
Derivative Asset, Fair Value, Gross Asset	2.0	4.0
Derivative, Collateral, Obligation to Return Cash	(1.0)	0.0
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		7.0
Derivative, Collateral, Right to Reclaim Cash		0.0
Derivative Liability		7.0
Entergy Louisiana [Member] | Other Deferred Debits And Other Assets [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	8.3	5.3
Derivative Asset, Fair Value, Gross Asset	8.3	5.3
Derivative, Collateral, Obligation to Return Cash	0.0	0.0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	19.3	5.7
Derivative Asset, Fair Value, Gross Asset	19.3	5.7
Derivative, Collateral, Obligation to Return Cash	0.0	0.0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0.3	0.6
Derivative Asset, Fair Value, Gross Asset	0.3	0.6
Derivative, Collateral, Obligation to Return Cash	0.0	0.0
Entergy Mississippi [Member]
Liabilities:
Letters of Credit Outstanding, Amount	0.4	0.2
Entergy Mississippi [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	35.0
Derivative Asset, Fair Value, Gross Asset	35.0
Derivative, Collateral, Obligation to Return Cash	0.0
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0.2	0.3
Derivative Asset, Fair Value, Gross Asset	0.2	0.3
Derivative, Collateral, Obligation to Return Cash	0.0	0.0
Entergy Mississippi [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		6.7
Derivative, Collateral, Right to Reclaim Cash		0.0
Derivative Liability		6.7
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0.1	0.1
Derivative Asset, Fair Value, Gross Asset	0.1	0.1
Derivative, Collateral, Obligation to Return Cash	0.0	0.0
Entergy New Orleans [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		0.5
Derivative, Collateral, Right to Reclaim Cash		0.0
Derivative Liability		0.5
Entergy Arkansas [Member]
Liabilities:
Letters of Credit Outstanding, Amount	0.3
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0.4	2.3
Derivative Asset, Fair Value, Gross Asset	0.6	2.3
Derivative, Collateral, Obligation to Return Cash	(0.2)	0.0
Entergy Texas [Member]
Liabilities:
Letters of Credit Outstanding, Amount		0.1
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0.5	0.8
Derivative Asset, Fair Value, Gross Asset	0.5	0.8
Derivative, Collateral, Obligation to Return Cash	$ 0.0	$ 0.0