Retirement And Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer			$ 176,000
Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Contributions by Employer			34,507
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
Subsequent Event [Member] | Entergy Arkansas [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
Non-Qualified Pension Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net periodic benefit costs	$ 8,500	$ 4,300	13,100	$ 8,500
Settlement Charge Associated With Out Of Plan Payment Of Lump Sum Benefits	4,000		4,000
Non-Qualified Pension Plans [Member] | Entergy Arkansas [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Net periodic benefit costs	$ 267	$ 106	372	$ 212
Settlement Charge Associated With Out Of Plan Payment Of Lump Sum Benefits			$ 163