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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	$ 121.0	$ 0	$ 121.0	$ 0
Balance as of January 1,	(61.0)	52.0	(98.0)	178.0
Realized losses included in earnings	(28)	(8)	(59)	(22)
Unrealized gains included in earnings	35	(2)	88	3
Unrealized losses included in OCI	2	45	(220)	(74)
Unrealized gains included as a regulatory liability/asset	85	0	122	0
Purchases	3	0	8	0
Settlements	(101.0)	(4.0)	94.0	(2.0)
Balance as of June 30,	56.0	83.0	56.0	83.0
Entergy Arkansas [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	4.2		4.2
Balance as of January 1,	2.7		0
Unrealized gains included as a regulatory liability/asset	2.8		10.6
Settlements	6.7		11.8
Balance as of June 30,	3.0		3.0
Entergy Gulf States [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	37.3		37.3
Balance as of January 1,	5.4		6.7
Unrealized gains included as a regulatory liability/asset	30.6		38.3
Settlements	26.1		35.1
Balance as of June 30,	47.2		47.2
Entergy Louisiana [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	21.5		21.5
Balance as of January 1,	3.0		5.7
Unrealized gains included as a regulatory liability/asset	11.5		16.8
Settlements	12.4		20.4
Balance as of June 30,	23.6		23.6
Entergy Mississippi [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	15.2		15.2
Balance as of January 1,	4.8		1.0
Unrealized gains included as a regulatory liability/asset	(2.8)		8.8
Settlements	4.5		12.3
Balance as of June 30,	12.7		12.7
Entergy New Orleans [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	8.3		8.3
Balance as of January 1,	1.0		2.0
Unrealized gains included as a regulatory liability/asset	2.5		4.5
Settlements	3.3		6.3
Balance as of June 30,	8.5		8.5
Entergy Texas [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Issuance of Fixed Transmission Rights	33.2		33.2
Balance as of January 1,	7.4		18.4
Unrealized gains included as a regulatory liability/asset	40.6		42.4
Settlements	33.4		46.2
Balance as of June 30,	$ 47.8		$ 47.8