Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Utility [Member]
Liabilities:
Letters of Credit Outstanding, Amount	$ 2,000,000	$ 4,000,000
Entergy Wholesale Commodities [Member]
Derivatives, Fair Value [Line Items]
Cash collateral posted	13,000,000	19,000,000
Assets:
Derivative, Collateral, Obligation to Return Cash	2,000,000
Liabilities:
Letters of Credit Held	51,000,000
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	2,000,000	20,000,000
Derivative, Collateral, Right to Reclaim Cash	2,000,000	7,000,000
Derivative Liability	0	13,000,000
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	2,000,000
Derivative, Collateral, Right to Reclaim Cash	1,000,000
Derivative Liability	1,000,000
Other Non-Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	1,000,000
Derivative, Collateral, Right to Reclaim Cash	0
Derivative Liability	1,000,000
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	19,000,000	0
Derivative Asset, Fair Value, Gross Asset	21,000,000	7,000,000
Derivative, Collateral, Obligation to Return Cash	2,000,000	7,000,000
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0	1,000,000
Derivative Asset, Fair Value, Gross Asset	1,000,000	1,000,000
Derivative, Collateral, Obligation to Return Cash	1,000,000	0
Other Deferred Debits And Other Assets [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	1,000,000	2,000,000
Derivative Asset, Fair Value, Gross Asset	1,000,000	2,000,000
Derivative, Collateral, Obligation to Return Cash		0
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	49,000,000	0
Derivative Asset, Fair Value, Gross Asset	51,000,000	32,000,000
Derivative, Collateral, Obligation to Return Cash	2,000,000	32,000,000
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	5,000,000	2,000,000
Derivative Asset, Fair Value, Gross Asset	8,000,000	4,000,000
Derivative, Collateral, Obligation to Return Cash	3,000,000	2,000,000
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	29,000,000	15,000,000
Derivative Asset, Fair Value, Gross Asset	31,000,000	16,000,000
Derivative, Collateral, Obligation to Return Cash	2,000,000	1,000,000
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	3,000,000	54,000,000
Derivative, Collateral, Right to Reclaim Cash	3,000,000	33,000,000
Derivative Liability	0	21,000,000
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	3,000,000	1,000,000
Derivative, Collateral, Right to Reclaim Cash	3,000,000	1,000,000
Derivative Liability	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	5,000,000	1,000,000
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	5,000,000	1,000,000
Entergy Louisiana [Member] | Other Non-Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	700,000
Derivative, Collateral, Right to Reclaim Cash	0
Derivative Liability	700,000
Entergy Louisiana [Member] | Other Deferred Debits And Other Assets [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	1,400,000	1,600,000
Derivative Asset, Fair Value, Gross Asset	1,400,000	1,600,000
Derivative, Collateral, Obligation to Return Cash	0	0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	100,000	300,000
Derivative Asset, Fair Value, Gross Asset	100,000	300,000
Derivative, Collateral, Obligation to Return Cash	0	0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	15,600,000	8,300,000
Derivative Asset, Fair Value, Gross Asset	15,900,000	8,400,000
Derivative, Collateral, Obligation to Return Cash	(300,000)	(100,000)
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	1,900,000	1,100,000
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	1,900,000	1,100,000
Entergy Mississippi [Member]
Liabilities:
Letters of Credit Outstanding, Amount	200,000	200,000
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	2,800,000	2,200,000
Derivative Asset, Fair Value, Gross Asset	2,800,000	2,200,000
Derivative, Collateral, Obligation to Return Cash	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	3,100,000
Derivative, Collateral, Right to Reclaim Cash	0
Derivative Liability	3,100,000
Entergy New Orleans [Member]
Liabilities:
Letters of Credit Outstanding, Amount	10,200
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	2,000,000.0	1,300,000
Derivative Asset, Fair Value, Gross Asset	2,100,000	1,300,000
Derivative, Collateral, Obligation to Return Cash	(100,000)	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		100,000
Derivative, Collateral, Right to Reclaim Cash		0
Derivative Liability		100,000
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	8,200,000	3,400,000
Derivative Asset, Fair Value, Gross Asset	8,300,000	3,600,000
Derivative, Collateral, Obligation to Return Cash	(100,000)	(200,000)
Entergy Texas [Member]
Liabilities:
Letters of Credit Outstanding, Amount	2,200,000	4,100,000
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	600,000
Derivative Asset, Fair Value, Gross Asset	2,100,000
Derivative, Collateral, Obligation to Return Cash	$ (1,500,000)
Entergy Texas [Member] | Other Current Liabilities [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative, Collateral, Obligation to Return Cash		(1,400,000)
Liabilities:
Derivative Liability, Fair Value, Gross Liability		900,000
Derivative Liability		$ (500,000)