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Stock Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2012
Sep. 30, 2012
Jan. 31, 2012
Equity Ownership And Long Term Cash Incentive Plan Two Thousand Eleven [Member]
Jan. 27, 2012
Equity Ownership And Long Term Cash Incentive Plan Two Thousand Eleven [Member]
Jan. 31, 2011
Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period 552,400        
Intrinsic value in the money stock options   $ 17.2      
Weighted-average grant-date fair value of options granted $ 9.42        
Weighted-average exercise price of stock options outstanding   $ 79.16      
Stock options outstanding   9,639,169      
Restricted stock awards granted         339,700
Long-term incentive plan awards     176,742    
Restricted stock awards granted value         $ 71.30
LTIP awards granted value       $ 67.11  
Vesting period of awards under Entergy's plans, years   3 years