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Retirement And Other Postretirement Benefits (Components Of Qualified Net Pension Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Pension Plans Defined Benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | $ 35,811 | $ 43,762
Interest cost on projected benefit obligation | 65,403 | 75,694
Expected return on assets | (97,366) | (98,655)
Amortization of prior service cost (credit) | 270 | 390
Amortization of loss | 48,824 | 58,981
Defined Benefit Plan, Special Termination Benefits | 0 | 76
Net other postretirement benefit cost | 52,942 | 80,248
Pension Plans Defined Benefit [Member] | Entergy Arkansas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 5,181 | 6,661
Interest cost on projected benefit obligation | 13,055 | 15,471
Expected return on assets | (19,772) | (20,026)
Amortization of loss | 10,936 | 13,564
Net other postretirement benefit cost | 9,400 | 15,670
Pension Plans Defined Benefit [Member] | Entergy Louisiana [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 7,049 | 8,599
Interest cost on projected benefit obligation | 14,870 | 17,367
Expected return on assets | (22,096) | (22,701)
Amortization of loss | 11,946 | 14,951
Net other postretirement benefit cost | 11,769 | 18,216
Pension Plans Defined Benefit [Member] | Entergy Mississippi [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,562 | 1,982
Interest cost on projected benefit obligation | 3,811 | 4,502
Expected return on assets | (5,981) | (6,105)
Amortization of loss | 2,985 | 3,724
Net other postretirement benefit cost | 2,377 | 4,103
Pension Plans Defined Benefit [Member] | Entergy New Orleans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 656 | 849
Interest cost on projected benefit obligation | 1,814 | 2,108
Expected return on assets | (2,687) | (2,725)
Amortization of loss | 1,615 | 2,013
Net other postretirement benefit cost | 1,398 | 2,245
Pension Plans Defined Benefit [Member] | Entergy Texas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,416 | 1,645
Interest cost on projected benefit obligation | 3,557 | 4,354
Expected return on assets | (6,062) | (6,222)
Amortization of loss | 2,340 | 3,238
Net other postretirement benefit cost | 1,251 | 3,015
Pension Plans Defined Benefit [Member] | System Energy [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,566 | 1,957
Interest cost on projected benefit obligation | 2,992 | 3,493
Expected return on assets | (4,459) | (4,568)
Amortization of loss | 2,604 | 3,264
Net other postretirement benefit cost | 2,703 | 4,146
Other Postretirement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 8,073 | 11,326
Interest cost on projected benefit obligation | 14,083 | 17,984
Expected return on assets | (10,455) | (11,344)
Amortization of prior service cost (credit) | (11,373) | (9,320)
Amortization of loss | 4,554 | 7,893
Net other postretirement benefit cost | 4,882 | 16,539
Other Postretirement [Member] | Entergy Arkansas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 978 | 1,739
Interest cost on projected benefit obligation | 2,324 | 3,130
Expected return on assets | (4,464) | (4,798)
Amortization of prior service cost (credit) | (1,368) | (610)
Amortization of loss | 1,064 | 1,339
Net other postretirement benefit cost | (1,466) | 800
Other Postretirement [Member] | Entergy Louisiana [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 1,869 | 2,474
Interest cost on projected benefit obligation | 3,260 | 4,078
Expected return on assets | 0 | 0
Amortization of prior service cost (credit) | (1,947) | (1,867)
Amortization of loss | 731 | 1,780
Net other postretirement benefit cost | 3,913 | 6,465
Other Postretirement [Member] | Entergy Mississippi [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 386 | 507
Interest cost on projected benefit obligation | 709 | 859
Expected return on assets | (1,379) | (1,542)
Amortization of prior service cost (credit) | (234) | (229)
Amortization of loss | 223 | 215
Net other postretirement benefit cost | (295) | (190)
Other Postretirement [Member] | Entergy New Orleans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 156 | 205
Interest cost on projected benefit obligation | 448 | 652
Expected return on assets | (1,154) | (1,201)
Amortization of prior service cost (credit) | (186) | (177)
Amortization of loss | 37 | 118
Net other postretirement benefit cost | (699) | (403)
Other Postretirement [Member] | Entergy Texas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 398 | 500
Interest cost on projected benefit obligation | 1,039 | 1,342
Expected return on assets | (2,394) | (2,588)
Amortization of prior service cost (credit) | (681) | (681)
Amortization of loss | 537 | 685
Net other postretirement benefit cost | (1,101) | (742)
Other Postretirement [Member] | System Energy [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost - benefits earned during the period | 334 | 470
Interest cost on projected benefit obligation | 529 | 628
Expected return on assets | (814) | (911)
Amortization of prior service cost (credit) | (393) | (366)
Amortization of loss | 287 | 300
Net other postretirement benefit cost | (57) | 121
Non-Qualified Pension Plans [Member] | Parent Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 4,300 | 4,500
Non-Qualified Pension Plans [Member] | Entergy Arkansas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 106 | 113
Non-Qualified Pension Plans [Member] | Entergy Louisiana [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 59 | 68
Non-Qualified Pension Plans [Member] | Entergy Mississippi [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 59 | 59
Non-Qualified Pension Plans [Member] | Entergy New Orleans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | 16 | 16
Non-Qualified Pension Plans [Member] | Entergy Texas [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net other postretirement benefit cost | $ 127 | $ 149

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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