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Retirement And Other Postretirement Benefits (Components Of Qualified Net Pension Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Pension Plans Defined Benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | $ 38,752 | $ 33,410
Interest cost on projected benefit obligation | 66,854 | 65,206
Expected return on assets | (110,535) | (102,056)
Amortization of prior service cost (credit) | 99 | 65
Amortization of loss | 68,526 | 56,930
Net other postretirement benefit cost | 63,696 | 53,555
Pension Plans Defined Benefit [Member] | Entergy Arkansas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 6,189 | 5,090
Interest cost on projected benefit obligation | 13,004 | 12,944
Expected return on assets | (21,851) | (20,427)
Amortization of loss | 13,412 | 11,640
Net other postretirement benefit cost | 10,754 | 9,247
Pension Plans Defined Benefit [Member] | Entergy Louisiana [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 8,446 | 6,925
Interest cost on projected benefit obligation | 14,940 | 14,809
Expected return on assets | (24,809) | (23,017)
Amortization of loss | 14,450 | 12,354
Net other postretirement benefit cost | 13,027 | 11,071
Pension Plans Defined Benefit [Member] | Entergy Mississippi [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,822 | 1,472
Interest cost on projected benefit obligation | 3,769 | 3,732
Expected return on assets | (6,502) | (6,131)
Amortization of loss | 3,610 | 3,053
Net other postretirement benefit cost | 2,699 | 2,126
Pension Plans Defined Benefit [Member] | Entergy New Orleans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 673 | 625
Interest cost on projected benefit obligation | 1,813 | 1,791
Expected return on assets | (2,993) | (2,800)
Amortization of loss | 1,954 | 1,658
Net other postretirement benefit cost | 1,447 | 1,274
Pension Plans Defined Benefit [Member] | Entergy Texas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,589 | 1,364
Interest cost on projected benefit obligation | 3,348 | 3,392
Expected return on assets | (6,523) | (6,180)
Amortization of loss | 2,626 | 2,310
Net other postretirement benefit cost | 1,040 | 886
Pension Plans Defined Benefit [Member] | System Energy [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,776 | 1,536
Interest cost on projected benefit obligation | 3,227 | 3,091
Expected return on assets | (4,991) | (4,663)
Amortization of loss | 3,715 | 2,964
Net other postretirement benefit cost | 3,727 | 2,928
Other Postretirement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 6,782 | 6,729
Interest cost on projected benefit obligation | 12,681 | 13,960
Expected return on assets | (10,373) | (9,408)
Amortization of prior service cost (credit) | (9,251) | (10,356)
Amortization of loss | 3,432 | 5,476
Net other postretirement benefit cost | 3,271 | 6,401
Other Postretirement [Member] | Entergy Arkansas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 793 | 863
Interest cost on projected benefit obligation | 1,997 | 2,255
Expected return on assets | (4,342) | (3,959)
Amortization of prior service cost (credit) | (1,278) | (1,278)
Amortization of loss | 289 | 1,115
Net other postretirement benefit cost | (2,541) | (1,004)
Other Postretirement [Member] | Entergy Louisiana [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,556 | 1,593
Interest cost on projected benefit obligation | 2,789 | 3,025
Expected return on assets | 0 | 0
Amortization of prior service cost (credit) | (1,934) | (1,934)
Amortization of loss | 388 | 465
Net other postretirement benefit cost | 2,799 | 3,149
Other Postretirement [Member] | Entergy Mississippi [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 321 | 290
Interest cost on projected benefit obligation | 683 | 690
Expected return on assets | (1,303) | (1,200)
Amortization of prior service cost (credit) | (456) | (456)
Amortization of loss | 377 | 419
Net other postretirement benefit cost | (378) | (257)
Other Postretirement [Member] | Entergy New Orleans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 129 | 142
Interest cost on projected benefit obligation | 417 | 469
Expected return on assets | (1,313) | (1,159)
Amortization of prior service cost (credit) | (186) | (186)
Amortization of loss | 34 | 105
Net other postretirement benefit cost | (919) | (629)
Other Postretirement [Member] | Entergy Texas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 330 | 372
Interest cost on projected benefit obligation | 939 | 1,124
Expected return on assets | (2,446) | (2,180)
Amortization of prior service cost (credit) | (579) | (579)
Amortization of loss | 206 | 826
Net other postretirement benefit cost | (1,550) | (437)
Other Postretirement [Member] | System Energy [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 306 | 320
Interest cost on projected benefit obligation | 500 | 559
Expected return on assets | (783) | (717)
Amortization of prior service cost (credit) | (378) | (378)
Amortization of loss | 233 | 390
Net other postretirement benefit cost | (122) | 174
Non Qualified Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 8,900 | 4,600
Non Qualified Pension Plans [Member] | Entergy Arkansas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 132 | 105
Non Qualified Pension Plans [Member] | Entergy Louisiana [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 50 | 48
Non Qualified Pension Plans [Member] | Entergy Mississippi [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 80 | 64
Non Qualified Pension Plans [Member] | Entergy New Orleans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 21 | 18
Non Qualified Pension Plans [Member] | Entergy Texas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | $ 137 | $ 127

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