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, 2016 USD ($)
1 Percentage Point Increase, Impact on the APBO	$ 173,057
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	12,281
1 Percentage Point Decrease, Impact on the APBO	(144,460)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(9,928)
Entergy Arkansas [Member]
1 Percentage Point Increase, Impact on the APBO	25,743
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	1,609
1 Percentage Point Decrease, Impact on the APBO	(21,520)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(1,313)
Entergy Louisiana [Member]
1 Percentage Point Increase, Impact on the APBO	37,874
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	2,910
1 Percentage Point Decrease, Impact on the APBO	(31,510)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(2,343)
Entergy Mississippi [Member]
1 Percentage Point Increase, Impact on the APBO	7,997
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	625
1 Percentage Point Decrease, Impact on the APBO	(6,710)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(498)
Entergy New Orleans [Member]
1 Percentage Point Increase, Impact on the APBO	4,941
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	259
1 Percentage Point Decrease, Impact on the APBO	(4,184)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(214)
Entergy Texas [Member]
1 Percentage Point Increase, Impact on the APBO	14,187
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	758
1 Percentage Point Decrease, Impact on the APBO	(11,896)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(619)
System Energy [Member]
1 Percentage Point Increase, Impact on the APBO	7,750
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	489
1 Percentage Point Decrease, Impact on the APBO	(6,401)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	$ (394)