Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Cash collateral posted	$ 1,000	$ 1,000
Assets:
Derivative, Collateral, Obligation to Return Cash	6,000	4,000
Liabilities:
Letters of Credit Outstanding, Amount	69,000	34,000
Entergy Wholesale Commodities [Member]
Derivatives, Fair Value [Line Items]
Cash collateral posted	500	1,000
Assets:
Derivative, Collateral, Obligation to Return Cash	6,000	4,000
Liabilities:
Letters of Credit Outstanding, Amount		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	5,000	17,000
Derivative, Collateral, Right to Reclaim Cash	5,000	14,000
Derivative Liability	0	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	26,000	5,000
Derivative Asset, Fair Value, Gross Asset	31,000	19,000
Derivative, Collateral, Obligation to Return Cash	5,000	14,000
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	49,000	0
Derivative Asset, Fair Value, Gross Asset	63,000	19,000
Derivative, Collateral, Obligation to Return Cash	14,000	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	3,000	9,000
Derivative, Collateral, Obligation to Return Cash	3,000	9,000
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	8,000	21,000
Derivative Asset, Fair Value, Gross Asset	9,000	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	13,000	86,000
Derivative, Collateral, Right to Reclaim Cash	13,000	20,000
Derivative Liability	0	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	4,000	9,000
Derivative, Collateral, Right to Reclaim Cash	4,000	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	1,000	6,000
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	1,000	6,000
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	3,400	10,200
Derivative Asset, Fair Value, Gross Asset	3,800	11,000
Derivative, Collateral, Obligation to Return Cash	(400)	(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	1,200	5,000
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	1,200	5,000
Entergy Mississippi [Member]
Liabilities:
Letters of Credit Outstanding, Amount	100	100
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	900	2,100
Derivative Asset, Fair Value, Gross Asset	900	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	200	1,200
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	200	1,200
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	700	2,200
Derivative Asset, Fair Value, Gross Asset	700	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	200	200
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	1,800	3,000
Derivative Asset, Fair Value, Gross Asset	1,900	3,200
Derivative, Collateral, Obligation to Return Cash	(100)	(200)
Entergy Texas [Member]
Liabilities:
Letters of Credit Outstanding, Amount	200	50
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset	1,400	3,400
Derivative Asset, Fair Value, Gross Asset	1,400	3,600
Derivative, Collateral, Obligation to Return Cash	$ 0	$ (200)