Retirement, Other Postretirement Benefits, And Defined Contribution Plans (One Percentage Point Change In Assumed Health Care Cost Trend Rate) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
1 Percentage Point Increase, Impact on the APBO	$ 181,998
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	19,022
1 Percentage Point Decrease, Impact on the APBO	(150,324)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(15,071)
Entergy Arkansas [Member]
1 Percentage Point Increase, Impact on the APBO	27,571
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	3,112
1 Percentage Point Decrease, Impact on the APBO	(22,839)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(2,442)
Entergy Louisiana [Member]
1 Percentage Point Increase, Impact on the APBO	42,312
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	4,132
1 Percentage Point Decrease, Impact on the APBO	(34,837)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(3,274)
Entergy Mississippi [Member]
1 Percentage Point Increase, Impact on the APBO	9,032
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	850
1 Percentage Point Decrease, Impact on the APBO	(7,412)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(668)
Entergy New Orleans [Member]
1 Percentage Point Increase, Impact on the APBO	4,741
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	404
1 Percentage Point Decrease, Impact on the APBO	(3,985)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(329)
Entergy Texas [Member]
1 Percentage Point Increase, Impact on the APBO	13,195
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	1,055
1 Percentage Point Decrease, Impact on the APBO	(10,991)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(851)
System Energy [Member]
1 Percentage Point Increase, Impact on the APBO	7,422
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	721
1 Percentage Point Decrease, Impact on the APBO	(6,085)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	$ (570)