Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	$ 176,000
Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		$ 409,900
Entergy Louisiana [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	37,519
Entergy Louisiana [Member] | Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		87,923
Defined Benefit Plan Remaining Contributions To Be Made In Current Fiscal Year		50,404
Entergy Mississippi [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	8,251
Entergy Mississippi [Member] | Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		19,146
Defined Benefit Plan Remaining Contributions To Be Made In Current Fiscal Year		10,895
Entergy New Orleans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	4,361
Entergy New Orleans [Member] | Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		9,920
Defined Benefit Plan Remaining Contributions To Be Made In Current Fiscal Year		5,559
Entergy Texas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	7,227
Entergy Texas [Member] | Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		17,064
Defined Benefit Plan Remaining Contributions To Be Made In Current Fiscal Year		9,837
System Energy [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	8,182
System Energy [Member] | Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		18,180
Defined Benefit Plan Remaining Contributions To Be Made In Current Fiscal Year		9,998
Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer	$ 34,507
Entergy Arkansas [Member] | Subsequent Event [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		79,495
Defined Benefit Plan Remaining Contributions To Be Made In Current Fiscal Year		$ 44,988