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, 2018 USD ($)
1 Percentage Point Increase, Impact on the APBO	$ 120,335
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	9,254
1 Percentage Point Decrease, Impact on the APBO	(100,393)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(7,593)
Entergy Arkansas [Member]
1 Percentage Point Increase, Impact on the APBO	15,906
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	1,129
1 Percentage Point Decrease, Impact on the APBO	(13,323)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(942)
Entergy Louisiana [Member]
1 Percentage Point Increase, Impact on the APBO	27,684
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	2,112
1 Percentage Point Decrease, Impact on the APBO	(23,071)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(1,732)
Entergy Mississippi [Member]
1 Percentage Point Increase, Impact on the APBO	6,768
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	460
1 Percentage Point Decrease, Impact on the APBO	(5,665)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(379)
Entergy New Orleans [Member]
1 Percentage Point Increase, Impact on the APBO	3,281
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	217
1 Percentage Point Decrease, Impact on the APBO	(2,784)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(180)
Entergy Texas [Member]
1 Percentage Point Increase, Impact on the APBO	8,673
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	605
1 Percentage Point Decrease, Impact on the APBO	(7,292)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	(498)
System Energy [Member]
1 Percentage Point Increase, Impact on the APBO	5,537
1 Percentage Point Increase, Impact on the sum of service costs and interest cost	416
1 Percentage Point Decrease, Impact on the APBO	(4,578)
1 Percentage Point Decrease, Impact on the sum of service costs and interest cost	$ (339)