Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
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	$ 33.0	[1]
Derivative liability as hedging instrument offset	(14)	[2]
Derivative Liability	19.0	[3],[4]
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	14.0	[1]
Derivative liability as hedging instrument offset	(10)	[2]
Derivative Liability	4.0	[3],[4]
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	21.0	[1]	17.0	[1]
Derivative asset as hedging instrument offset	(16)	[2]	(17)	[2]
Derivative Asset	5	[3],[4]	0	[3],[4]
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, Fair Value, Gross Asset	8.0	[1]
Derivative asset as hedging instrument offset	(8)	[2]
Derivative Asset	0	[3],[4]
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	118.0	[1]	118.0	[1]
Derivative asset as hedging instrument offset	(117)	[2]	(99)	[2]
Derivative Asset	1	[3],[4]	19	[3],[4]
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	93.0	[1]	177.0	[1]
Derivative asset as hedging instrument offset	(82)	[2]	(122)	[2]
Derivative Asset	11	[3],[4]	55	[3],[4]
Prepayments And Other [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset			6.0	[1]
Derivative asset as hedging instrument offset			0	[2]
Derivative Asset			6	[3],[4]
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	92.0		36.0	[1]
Derivative asset as hedging instrument offset	(9)		(2)	[2]
Derivative Asset	83		34	[3],[4]
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	206.0	[1]	197.0	[1]
Derivative liability as hedging instrument offset	(145)	[2]	(131)	[2]
Derivative Liability	61.0	[3],[4]	66.0	[3],[4]
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	78.0	[1]	201.0	[1]
Derivative liability as hedging instrument offset	(54)	[2]	(89)	[2]
Derivative Liability	24.0	[3],[4]	112.0	[3],[4]
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	1.0	[1]
Derivative Liability	1.0	[3],[4]
Other Noncurrent Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability			46.0	[1]
Derivative liability as hedging instrument offset			(17)	[2]
Derivative Liability			29.0	[3],[4]
Entergy Gulf States Louisiana [Member] | Gas Hedge Contracts [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset			2.2
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0.5
Entergy Gulf States Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	26.8		6.7
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset			2.9
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0.3
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	14.7		5.7
Entergy Mississippi [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset			0.7
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0.1
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	6.1		1.0
Entergy New Orleans [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset			0.1
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0.1
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	6.0		2.0
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	0.5
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset, Fair Value, Gross Asset	$ 27.5		$ 18.4

[1] Represents the gross amounts of recognized assets/liabilities

[2] Represents the netting of fair value balances with the same counterparty

[3] Represents the net amounts of assets /liabilities presented on the Entergy Consolidated Balance Sheets

[4] Excludes cash collateral in the amounts of $4 million posted as of September 30, 2014 and $47 million posted and $4 million held as of December 31, 2013