Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Change in Plan Assets
Expected current year pension contributions	$ 396,000
Pension contributions made through Year To Date	164,200
Entergy Arkansas [Member]
Change in Plan Assets
Expected current year pension contributions	92,458
Pension contributions made through Year To Date	38,419
Remaining estimated pension contributions to be made in current year	54,039
Entergy Gulf States Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	32,471
Pension contributions made through Year To Date	13,207
Remaining estimated pension contributions to be made in current year	19,264
Entergy Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	56,986
Pension contributions made through Year To Date	23,579
Remaining estimated pension contributions to be made in current year	33,407
Entergy Mississippi [Member]
Change in Plan Assets
Expected current year pension contributions	22,473
Pension contributions made through Year To Date	9,249
Remaining estimated pension contributions to be made in current year	13,224
Entergy New Orleans [Member]
Change in Plan Assets
Expected current year pension contributions	10,918
Pension contributions made through Year To Date	4,509
Remaining estimated pension contributions to be made in current year	6,409
Entergy Texas [Member]
Change in Plan Assets
Expected current year pension contributions	17,167
Pension contributions made through Year To Date	7,042
Remaining estimated pension contributions to be made in current year	10,125
System Energy [Member]
Change in Plan Assets
Expected current year pension contributions	20,796
Pension contributions made through Year To Date	8,726
Remaining estimated pension contributions to be made in current year	$ 12,070