Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Change in Plan Assets
Expected current year pension contributions	$ 396,000
Pension contributions made through Year To Date	376,000
Entergy Arkansas [Member]
Change in Plan Assets
Expected current year pension contributions	92,419
Pension contributions made through Year To Date	92,419
Remaining estimated pension contributions to be made in current year	0
Entergy Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	56,923
Pension contributions made through Year To Date	44,417
Remaining estimated pension contributions to be made in current year	12,506
Entergy Mississippi [Member]
Change in Plan Assets
Expected current year pension contributions	22,457
Pension contributions made through Year To Date	22,457
Remaining estimated pension contributions to be made in current year	0
Entergy New Orleans [Member]
Change in Plan Assets
Expected current year pension contributions	10,903
Pension contributions made through Year To Date	10,903
Remaining estimated pension contributions to be made in current year	0
Entergy Texas [Member]
Change in Plan Assets
Expected current year pension contributions	17,157
Pension contributions made through Year To Date	17,157
Remaining estimated pension contributions to be made in current year	0
System Energy [Member]
Change in Plan Assets
Expected current year pension contributions	20,885
Pension contributions made through Year To Date	20,885
Remaining estimated pension contributions to be made in current year	$ 0