Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 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	$ 23	[1]
Derivative liability as hedging instrument offset	(3)	[2]
Derivative Liability	20.0	[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	7.0	[1]	17.0	[1]
Derivative asset as hedging instrument offset	(2)	[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	1.0	[1]
Derivative asset as hedging instrument offset	(1)	[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	107.0	[1]	118.0	[1]
Derivative asset as hedging instrument offset	(102)	[2]	(99)	[2]
Derivative Asset	5	[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	100.0	[1]	177.0	[1]
Derivative asset as hedging instrument offset	(86)	[2]	(122)	[2]
Derivative Asset	14	[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	8.0		6.0	[1]
Derivative asset as hedging instrument offset			0	[2]
Derivative Asset	8		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	26.0		36.0	[1]
Derivative asset as hedging instrument offset	(1)		(2)	[2]
Derivative Asset	25		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	178	[1]	197	[1]
Derivative liability as hedging instrument offset	(125)	[2]	(131)	[2]
Derivative Liability	53.0	[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	100	[1]	201	[1]
Derivative liability as hedging instrument offset	(63)	[2]	(89)	[2]
Derivative Liability	37.0	[3],[4]	112.0	[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	[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	3.0		2.2
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	5.4		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	3.7		2.9
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	3.0		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	1.4		0.7
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	4.8		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
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	1.0		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	2.7
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	$ 7.4		$ 18.4

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

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

[3] Excludes cash collateral in the amounts of $65 million posted as of March 31, 2014 and $47 million posted and $4 million held as of December 31, 2013

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