Retirement, Other Postretirement Benefits, And Defined Contribution Plans (One Percentage Point Change In Assumed Health Care Cost Trend Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
1 Percentage Point Increase, Impact on the APBO	$ 234,971
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	16,769
1 Percentage Point Decrease, Impact on the APBO	(190,996)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(13,566)
Entergy Arkansas [Member]
1 Percentage Point Increase, Impact on the APBO	39,286
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	2,448
1 Percentage Point Decrease, Impact on the APBO	(31,753)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(1,971)
Entergy Gulf States Louisiana [Member]
1 Percentage Point Increase, Impact on the APBO	27,929
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	2,092
1 Percentage Point Decrease, Impact on the APBO	(22,591)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(1,671)
Entergy Louisiana [Member]
1 Percentage Point Increase, Impact on the APBO	23,779
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	1,681
1 Percentage Point Decrease, Impact on the APBO	(19,452)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(1,366)
Entergy Mississippi [Member]
1 Percentage Point Increase, Impact on the APBO	10,596
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	754
1 Percentage Point Decrease, Impact on the APBO	(8,596)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(606)
Entergy New Orleans [Member]
1 Percentage Point Increase, Impact on the APBO	6,373
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	386
1 Percentage Point Decrease, Impact on the APBO	(5,317)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(321)
Entergy Texas [Member]
1 Percentage Point Increase, Impact on the APBO	16,246
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	1,148
1 Percentage Point Decrease, Impact on the APBO	(13,397)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(927)
System Energy [Member]
1 Percentage Point Increase, Impact on the APBO	8,716
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	734
1 Percentage Point Decrease, Impact on the APBO	(7,044)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	$ (586)