Risk Management and Fair Values (Reconciliation Of Changes In The Net Assets (Liabilities) For The Fair Value Of Derivatives Classified As Level 3 In The Fair Value Hierarchy) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Entergy Arkansas [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	$ 3.0		$ 0
Issuance of Fixed Transmission Rights			4.2
Unrealized gains included as a regulatory liability/asset	2.4		13.0
Settlements	4.9		16.7
Balance as of September 30,	0.5		0.5
Entergy Gulf States Louisiana [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	47.2		6.7
Issuance of Fixed Transmission Rights			37.3
Unrealized gains included as a regulatory liability/asset	(9.8)		28.5
Settlements	10.6		45.7
Balance as of September 30,	26.8		26.8
Entergy Louisiana [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	23.6		5.7
Issuance of Fixed Transmission Rights			21.5
Unrealized gains included as a regulatory liability/asset	4.5		21.3
Settlements	13.4		33.8
Balance as of September 30,	14.7		14.7
Entergy Mississippi [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	12.7		1.0
Issuance of Fixed Transmission Rights			15.2
Unrealized gains included as a regulatory liability/asset	(3.3)		5.5
Settlements	3.3		15.6
Balance as of September 30,	6.1		6.1
Entergy New Orleans [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	8.5		2.0
Issuance of Fixed Transmission Rights			8.3
Unrealized gains included as a regulatory liability/asset	2.6		7.1
Settlements	5.1		11.4
Balance as of September 30,	6.0		6.0
Entergy Texas [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	47.8		18.4
Issuance of Fixed Transmission Rights			33.2
Unrealized gains included as a regulatory liability/asset	(10.5)		31.9
Settlements	9.8		56.0
Balance as of September 30,	27.5		27.5
Electricity Swaps And Options [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	(88.0)	83.0	(133.0)	178.0
Issuance of Fixed Transmission Rights			0	0
Realized losses included in earnings	(10)	(5)	(69)	(27)
Unrealized gains included in earnings	4	11	90	14
Unrealized losses included in OCI	37	(4)	(182)	(78)
Unrealized gains included as a regulatory liability/asset	0	0	0	0
Purchases	7	0	15	0
Settlements	(41.0)	36.0	188.0	38.0
Balance as of September 30,	(91.0)	49.0	(91.0)	49.0
Fixed Transmission Rights (FTRs) [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at Beginning of Period	144.0		34.0
Issuance of Fixed Transmission Rights			121.0
Realized losses included in earnings	0		0
Unrealized gains included in earnings	1		3
Unrealized losses included in OCI	0		0
Unrealized gains included as a regulatory liability/asset	(14)		108
Purchases	0		0
Settlements	(48.0)		(183.0)
Balance as of September 30,	$ 83.0		$ 83.0