Decommissioning Trust Funds (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Decommissioning Trust Funds [Abstract]
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts			$ 365,000,000		$ 329,000,000
Amortized cost of debt securities	1,921,000,000		1,921,000,000		1,843,000,000
Average coupon rate of debt securities	3.33%		3.33%
Average duration of debt securities, years			5 years 4 months 28 days
Average maturity of debt securities, years			7 years 11 months 5 days
Proceeds from the dispositions of debt securities	445,000,000	382,000,000	982,000,000	780,000,000
Gains from dispositions of debt securities, gross	6,000,000	16,000,000	12,000,000	22,000,000
Losses from dispositions of debt securities, gross	1,000,000	1,000,000	3,000,000	3,000,000
Entergy Arkansas [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	260,200,000		260,200,000		248,900,000
Average coupon rate of debt securities	2.68%		2.68%
Average duration of debt securities, years			4 years 9 months 30 days
Average maturity of debt securities, years			5 years 6 months 9 days
Proceeds from the dispositions of debt securities	25,000,000	87,000,000	70,300,000	143,100,000
Gains from dispositions of debt securities, gross	300,000	7,300,000	400,000	8,700,000
Losses from dispositions of debt securities, gross	100,000	10,000	300,000	100,000
Entergy Gulf States Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	222,800,000		222,800,000		199,100,000
Average coupon rate of debt securities	4.46%		4.46%
Average duration of debt securities, years			5 years 9 months 23 days
Average maturity of debt securities, years			9 years 5 months 17 days
Proceeds from the dispositions of debt securities	45,100,000	23,400,000	75,400,000	46,700,000
Gains from dispositions of debt securities, gross	500,000	5,200,000	700,000	6,300,000
Losses from dispositions of debt securities, gross	100,000	10,000	200,000	10,000
Entergy Louisiana [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	131,500,000		131,500,000		120,600,000
Average coupon rate of debt securities	3.09%		3.09%
Average duration of debt securities, years			5 years 0 months 22 days
Average maturity of debt securities, years			7 years 11 months 22 days
Proceeds from the dispositions of debt securities	11,600,000	5,900,000	29,700,000	9,500,000
Gains from dispositions of debt securities, gross	50,000	10,000	200,000	50,000
Losses from dispositions of debt securities, gross	200	10,000	4,100	20,000
System Energy [Member]
Decommissioning Trust Funds [Abstract]
Amortized cost of debt securities	236,800,000		236,800,000		223,400,000
Average coupon rate of debt securities	2.16%		2.16%
Average duration of debt securities, years			4 years 4 months 0 days
Average maturity of debt securities, years			5 years 11 months 5 days
Proceeds from the dispositions of debt securities	101,300,000	65,600,000	231,600,000	91,200,000
Gains from dispositions of debt securities, gross	400,000	800,000	1,400,000	800,000
Losses from dispositions of debt securities, gross	$ 100,000	$ 300,000	$ 300,000	$ 400,000