Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Utility [Member]
Liabilities:
Letters of Credit Outstanding, Amount	$ 1,000
Entergy Wholesale Commodities [Member]
Derivatives, Fair Value [Line Items]
Cash collateral posted	5,000	$ 1,000
Assets:
Derivative, Collateral, Obligation to Return Cash	3,000	4,000
Liabilities:
Letters of Credit Held	3,000	34,000
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	30,000	17,000
Derivative, Collateral, Right to Reclaim Cash	10,000	14,000
Derivative Liability	20,000	3,000
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0	5,000
Derivative Asset, Fair Value, Gross Asset	11,000	19,000
Derivative, Collateral, Obligation to Return Cash	11,000	14,000
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	8,000	0
Derivative Asset, Fair Value, Gross Asset	29,000	19,000
Derivative, Collateral, Obligation to Return Cash	21,000	19,000
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	0	0
Derivative Asset, Fair Value, Gross Asset	2,000	9,000
Derivative, Collateral, Obligation to Return Cash	2,000	9,000
Prepayments And Other [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	3,000
Derivative Asset, Fair Value, Gross Asset	3,000
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	41,000	21,000
Derivative Asset, Fair Value, Gross Asset	42,000	22,000
Derivative, Collateral, Obligation to Return Cash	(1,000)	1,000
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	34,000	86,000
Derivative, Collateral, Right to Reclaim Cash	21,000	20,000
Derivative Liability	13,000	66,000
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	2,000	9,000
Derivative, Collateral, Right to Reclaim Cash	2,000	8,000
Derivative Liability	0	1,000
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		6,000
Derivative, Collateral, Right to Reclaim Cash		0
Derivative Liability		6,000
Entergy Louisiana [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	2,700
Derivative Asset, Fair Value, Gross Asset	2,700
Derivative, Collateral, Obligation to Return Cash	0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	18,200	10,200
Derivative Asset, Fair Value, Gross Asset	18,500	11,000
Derivative, Collateral, Obligation to Return Cash	(300)	(800)
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability		5,000
Derivative, Collateral, Right to Reclaim Cash		0
Derivative Liability		5,000
Entergy Mississippi [Member]
Liabilities:
Letters of Credit Outstanding, Amount	200	100
Entergy Mississippi [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	500
Derivative Asset, Fair Value, Gross Asset	500
Derivative, Collateral, Obligation to Return Cash	0
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	4,400	2,100
Derivative Asset, Fair Value, Gross Asset	4,400	2,100
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		1,200
Derivative, Collateral, Right to Reclaim Cash		0
Derivative Liability		1,200
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	3,000	2,200
Derivative Asset, Fair Value, Gross Asset	3,000	2,200
Derivative, Collateral, Obligation to Return Cash	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		200
Derivative, Collateral, Right to Reclaim Cash		0
Derivative Liability		200
Entergy Arkansas [Member]
Liabilities:
Letters of Credit Outstanding, Amount	600	200
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	10,500	3,000
Derivative Asset, Fair Value, Gross Asset	11,100	3,200
Derivative, Collateral, Obligation to Return Cash	(600)	(200)
Entergy Texas [Member]
Liabilities:
Letters of Credit Outstanding, Amount		50
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	4,700	3,400
Derivative Asset, Fair Value, Gross Asset	5,300	3,600
Derivative, Collateral, Obligation to Return Cash	$ (600)	$ (200)