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		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,	$ (98.0)	$ 178.0	$ 178.0
Realized losses included in earnings	(31)		(14)
Unrealized gains included in earnings	53		5
Unrealized losses included in OCI	(222)	(119)
Unrealized gains included as a regulatory asset/liability	37	0
Purchases	5	0
Settlements	195.0	2.0
Balance as of March 31,	(61.0)	52.0	(98.0)
Entergy Arkansas [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,		0	0
Unrealized gains included as a regulatory liability/asset			7.8
Settlements			5.1
Balance as of March 31,			2.7
Entergy Gulf States [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,		6.7	6.7
Unrealized gains included as a regulatory liability/asset			7.7
Settlements			9.0
Balance as of March 31,			5.4
Entergy Louisiana [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,		5.7	5.7
Unrealized gains included as a regulatory liability/asset			5.3
Settlements			8.0
Balance as of March 31,			3.0
Entergy Mississippi [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,		1.0	1.0
Unrealized gains included as a regulatory liability/asset			11.6
Settlements			7.8
Balance as of March 31,			4.8
Entergy New Orleans [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,		2.0	2.0
Unrealized gains included as a regulatory liability/asset			2.0
Settlements			3.0
Balance as of March 31,			1.0
Entergy Texas [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance as of January 1,		18.4	18.4
Unrealized gains included as a regulatory liability/asset			1.8
Settlements			12.8
Balance as of March 31,			$ 7.4