Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016
Change in Plan Assets
Expected current year pension contributions	$ 169,800
Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		$ 387,500
Entergy Arkansas [Member]
Change in Plan Assets
Expected current year pension contributions	36,549
Remaining estimated pension contributions to be made in current year	46,282
Entergy Arkansas [Member] | Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		82,831
Entergy Louisiana [Member]
Change in Plan Assets
Expected current year pension contributions	37,319
Remaining estimated pension contributions to be made in current year	46,590
Entergy Louisiana [Member] | Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		83,909
Entergy Mississippi [Member]
Change in Plan Assets
Expected current year pension contributions	8,919
Remaining estimated pension contributions to be made in current year	10,994
Entergy Mississippi [Member] | Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		19,913
Entergy New Orleans [Member]
Change in Plan Assets
Expected current year pension contributions	4,680
Remaining estimated pension contributions to be made in current year	6,014
Entergy New Orleans [Member] | Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		10,694
Entergy Texas [Member]
Change in Plan Assets
Expected current year pension contributions	6,999
Remaining estimated pension contributions to be made in current year	8,771
Entergy Texas [Member] | Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		15,770
System Energy [Member]
Change in Plan Assets
Expected current year pension contributions	8,891
Remaining estimated pension contributions to be made in current year	$ 11,315
System Energy [Member] | Subsequent Event [Member]
Change in Plan Assets
Pension contributions made through Year To Date		$ 20,206