Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Change in Plan Assets
Expected current year pension contributions	$ 396,000
Pension contributions made through Year To Date	78,500
Entergy Arkansas [Member]
Change in Plan Assets
Expected current year pension contributions	92,458
Pension contributions made through Year To Date	19,093
Remaining estimated pension contributions to be made in current year	73,365
Entergy Gulf States Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	32,471
Pension contributions made through Year To Date	5,959
Remaining estimated pension contributions to be made in current year	26,512
Entergy Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	56,986
Pension contributions made through Year To Date	11,073
Remaining estimated pension contributions to be made in current year	45,913
Entergy Mississippi [Member]
Change in Plan Assets
Expected current year pension contributions	22,473
Pension contributions made through Year To Date	4,385
Remaining estimated pension contributions to be made in current year	18,088
Entergy New Orleans [Member]
Change in Plan Assets
Expected current year pension contributions	10,918
Pension contributions made through Year To Date	2,101
Remaining estimated pension contributions to be made in current year	8,817
Entergy Texas [Member]
Change in Plan Assets
Expected current year pension contributions	17,167
Pension contributions made through Year To Date	3,279
Remaining estimated pension contributions to be made in current year	13,888
System Energy [Member]
Change in Plan Assets
Expected current year pension contributions	20,796
Pension contributions made through Year To Date	4,272
Remaining estimated pension contributions to be made in current year	$ 16,524