Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Liabilities:
Cash collateral posted		$ 9.0
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated as Hedging Instrument [Member]
Assets:
Derivative asset, fair value	[1]	173.0	$ 149.0
Derivative asset as hedging instrument offset	[2]	(34.0)	(53.0)
Derivative asset, net	[3],[4]	139.0	96.0
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	[1]	54.0	97.0
Derivative asset as hedging instrument offset	[2]	(13.0)	(25.0)
Derivative asset, net	[3],[4]	41.0	72.0
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	[1]	24.0	50.0
Derivative asset as hedging instrument offset	[2]	(1.0)	(3.0)
Derivative asset, net	[3],[4]	23.0	47.0
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	[1]	17.0	48.0
Derivative asset as hedging instrument offset	[2]	(2.0)	0.0
Derivative asset, net	[3],[4]	15.0	48.0
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	[1]		9.0
Derivative asset as hedging instrument offset	[2]		(8.0)
Derivative asset, net	[3],[4]		1.0
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	[1]	2.0
Derivative liability as hedging instrument offset	[2]	(2.0)
Derivative liability, net	[3],[4]	0.0
Derivative Liability, Fair Value, Gross Liability	[1]	2.0
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	[1]		8.0
Derivative liability as hedging instrument offset	[2]		(8.0)
Derivative liability, net	[3],[4]		0.0
Derivative Liability, Fair Value, Gross Liability	[1]		8.0
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	[1]	14.0	24.0
Derivative liability as hedging instrument offset	[2]	(14.0)	(24.0)
Derivative liability, net	[3],[4]	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	[1]	14.0	24.0
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	[1]	38.0	57.0
Derivative liability as hedging instrument offset	[2]	(32.0)	(55.0)
Derivative liability, net	[3],[4]	6.0	2.0
Derivative Liability, Fair Value, Gross Liability	[1]	38.0	57.0
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility Plants [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	[1]	9.0	20.0
Derivative liability as hedging instrument offset	[2]	0.0
Derivative liability, net	[3],[4]	9.0	20.0
Derivative Liability, Fair Value, Gross Liability	[1]	9.0	20.0
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, net	[5]	8.5	25.5
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability, net	[5]	7.0	15.8
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, net	[5]	2.4	3.4
Entergy Mississippi [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability, net	[5]	1.3	2.8
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, net	[5]	1.5	4.1
Entergy New Orleans [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative liability, net	[5]	0.5	0.9
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, net	[5]	2.2	12.3
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, net	[5]	$ 7.9	$ 0.7

[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 amount of $9 million posted and $68 million held as of December 31, 2015 and $25 million held as of December 31, 2014, respectively

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

[5] (a) No cash collateral was required to be posted as of December 31, 2015 and 2014, respectively.