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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	$ 178.0	$ 312.0	$ 197.0
Realized gains (losses) included in earnings	(38)	(11)	(13)
Unrealized gains (losses) included in earnings	(35)	(4)	6
Unrealized gains (losses) included in OCI	(204)	140	275
Issuances of FTRs	37.0	0	0
Purchases	14	9	15
Settlements	(50.0)	(268.0)	(168.0)
Balance as of End of Period	(98.0)	178.0	312.0
Entergy Arkansas [Member]
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	0
Issuances of FTRs	0
Unrealized gains (losses) included as a regulatory liability/asset	(0.1)
Settlements	0.1
Balance as of End of Period	0
Entergy Gulf States [Member]
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	0
Issuances of FTRs	7.2
Unrealized gains (losses) included as a regulatory liability/asset	(0.2)
Settlements	(0.3)
Balance as of End of Period	6.7
Entergy Louisiana [Member]
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	0
Issuances of FTRs	6.2
Unrealized gains (losses) included as a regulatory liability/asset	(0.3)
Settlements	(0.2)
Balance as of End of Period	5.7
Entergy Mississippi [Member]
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	0
Issuances of FTRs	1.1
Unrealized gains (losses) included as a regulatory liability/asset	0.9
Settlements	(1.0)
Balance as of End of Period	1.0
Entergy New Orleans [Member]
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	0
Issuances of FTRs	2.2
Unrealized gains (losses) included as a regulatory liability/asset	1.0
Settlements	(1.2)
Balance as of End of Period	2.0
Entergy Texas [Member]
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy [Roll Forward]
Balance as of Beginning of Period	0
Issuances of FTRs	20.0
Unrealized gains (losses) included as a regulatory liability/asset	(0.8)
Settlements	(0.8)
Balance as of End of Period	$ 18.4