Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Change in Plan Assets
Expected current year pension contributions	$ 88,200
Pension contributions made through Year To Date	387,500
Entergy Arkansas [Member]
Change in Plan Assets
Expected current year pension contributions	19,494
Pension contributions made through Year To Date	82,831
Remaining estimated pension contributions to be made in current year	63,337
Entergy Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	20,195
Pension contributions made through Year To Date	83,909
Remaining estimated pension contributions to be made in current year	63,714
Entergy Mississippi [Member]
Change in Plan Assets
Expected current year pension contributions	4,946
Pension contributions made through Year To Date	19,913
Remaining estimated pension contributions to be made in current year	14,967
Entergy New Orleans [Member]
Change in Plan Assets
Expected current year pension contributions	2,434
Pension contributions made through Year To Date	10,694
Remaining estimated pension contributions to be made in current year	8,260
Entergy Texas [Member]
Change in Plan Assets
Expected current year pension contributions	3,798
Pension contributions made through Year To Date	15,770
Remaining estimated pension contributions to be made in current year	11,972
System Energy [Member]
Change in Plan Assets
Expected current year pension contributions	4,613
Pension contributions made through Year To Date	20,206
Remaining estimated pension contributions to be made in current year	$ 15,593