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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Entergy Louisiana [Member]      
Variable Interest Entities (Textual) [Abstract]      
Payments on lease, including interest $ 31.0etr_PaymentsOnLeaseIncludingInterest
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember		 $ 26.3etr_PaymentsOnLeaseIncludingInterest
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember		 $ 39.1etr_PaymentsOnLeaseIncludingInterest
/ dei_LegalEntityAxis
= etr_EntergyLouisianaMember
System Energy [Member]      
Variable Interest Entities (Textual) [Abstract]      
Payments on lease, including interest $ 51.6etr_PaymentsOnLeaseIncludingInterest
/ dei_LegalEntityAxis
= etr_SystemEnergyMember		 $ 50.5etr_PaymentsOnLeaseIncludingInterest
/ dei_LegalEntityAxis
= etr_SystemEnergyMember		 $ 50.0etr_PaymentsOnLeaseIncludingInterest
/ dei_LegalEntityAxis
= etr_SystemEnergyMember