Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2016		Dec. 31, 2015
Assets:
Derivative asset as hedging instrument offset		$ (4.0)		$ (68.0)
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability as hedging instrument offset	[1]	(2.0)		(2.0)
Derivative Liability, Fair Value, Gross Liability	[2]	2.0		2.0
Derivative Liability	[3],[4]	0.0		0.0
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability as hedging instrument offset	[1]	(3.0)
Derivative Liability, Fair Value, Gross Liability	[2]	3.0
Derivative Liability	[3],[4]	0.0
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	[2]	20.0		17.0
Derivative asset as hedging instrument offset	[1]	(5.0)		(2.0)
Derivative Asset	[3],[4]	15.0		15.0
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	[2]	6.0
Derivative asset as hedging instrument offset	[1]	(1.0)
Derivative Asset	[3],[4]	5.0
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	[2]	67.0		173.0
Derivative asset as hedging instrument offset	[1]	(17.0)		(34.0)
Derivative Asset	[3],[4]	50.0		139.0
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	[2]	42.0		54.0
Derivative asset as hedging instrument offset	[1]	(17.0)		(13.0)
Derivative Asset	[3],[4]	25.0		41.0
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	[2]	32.0		24.0
Derivative asset as hedging instrument offset	[1]	(1.0)		(1.0)
Derivative Asset	[3],[4]	31.0		23.0
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability as hedging instrument offset	[1]	(1.0)		(14.0)
Derivative Liability, Fair Value, Gross Liability	[2]	1.0		14.0
Derivative Liability	[3],[4]	0.0		0.0
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability as hedging instrument offset	[1]	(34.0)		(32.0)
Derivative Liability, Fair Value, Gross Liability	[2]	34.0		38.0
Derivative Liability	[3],[4]	0.0		6.0
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability as hedging instrument offset		0.0	[2]	0.0	[1]
Derivative Liability, Fair Value, Gross Liability	[2]	1.0		9.0
Derivative Liability	[3],[4]	1.0		9.0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset		12.4		8.5
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability		0.4		7.0
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset		4.0		2.4
Entergy Mississippi [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability		0.1		1.3
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset		1.6		1.5
Entergy New Orleans [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability				0.5
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset		8.1		7.9
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative Asset		$ 5.1		$ 2.2

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

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

[3] Excludes cash collateral in the amount of $4 million posted and $4 million held as of September 30, 2016 and $9 million posted and $68 million held as of December 31, 2015. Also excludes letters of credit in the amount of $49 million held as of September 30, 2016.

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