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Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Schedule Of Benefit Obligations, Plan Assets, Funded Status, Amounts Recognized In The Balance Sheet) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in the balance sheet      
Current liabilities $ (71,612) $ (76,942)  
Non-current liabilities (2,910,654) (3,036,010)  
Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 7,142,567 6,848,238  
Service cost 133,641 143,244  
Interest cost 260,824 261,613  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 0 2,039  
Actuarial (gain)/loss 767,849 209,360  
Employee contributions 40 23  
Benefits Paid (317,834) (321,950)  
Balance at end of year 7,987,087 7,142,567 $ 6,848,238
Change in Plan Assets      
Fair value of assets at beginning of year 5,171,202 4,707,433  
Actual return on plan assets 808,007 395,596  
Employer contributions 409,901 390,100  
Employee contributions 40 23  
Benefits Paid (317,834) (321,950)  
Fair value of assets at end of year 6,071,316 5,171,202 4,707,433
Funded status (1,915,771) (1,971,365)  
Amounts recognized in the balance sheet      
Non-current liabilities (1,915,771) (1,971,365)  
Amounts recognized as a regulatory asset      
Net loss 2,418,206 2,326,349  
Amounts recognized as AOCI (before tax)      
Prior service cost 398 659  
Net loss 667,766 619,276  
Amount recognized as AOCI (before tax) 668,164 619,935  
Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 1,568,963 1,530,829  
Service cost 26,915 32,291 45,305
Interest cost 55,838 56,331 71,934
Plan amendments (2,564) (20,353)  
Actuarial (gain)/loss (23,409) 46,201  
Employee contributions 35,080 27,686  
Benefits Paid (97,829) (104,477)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 493 455  
Balance at end of year 1,563,487 1,568,963 1,530,829
Change in Plan Assets      
Fair value of assets at beginning of year 596,660 579,069  
Actual return on plan assets 81,143 38,216  
Employer contributions 44,273 56,166  
Employee contributions 35,080 27,686  
Benefits Paid (97,829) (104,477)  
Fair value of assets at end of year 659,327 596,660 579,069
Funded status (904,160) (972,303)  
Amounts recognized in the balance sheet      
Current liabilities (45,237) (45,255)  
Non-current liabilities (858,923) (927,048)  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 40,461 54,896  
Net loss 144,966 222,540  
Amortization of prior service credit (41,425) (45,490) (37,280)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 104,505 167,644  
Amounts recognized as AOCI (before tax)      
Prior service cost (65,047) (89,474)  
Net loss 161,322 172,575  
Amount recognized as AOCI (before tax) 96,275 83,101  
Entergy Arkansas [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (353,274) (424,234)  
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 1,454,310 1,400,511  
Service cost 20,358 20,724  
Interest cost 51,776 52,219  
Actuarial (gain)/loss 131,729 62,187  
Benefits Paid (77,417) (81,331)  
Balance at end of year 1,580,756 1,454,310 1,400,511
Change in Plan Assets      
Fair value of assets at beginning of year 1,041,592 959,618  
Actual return on plan assets 161,868 80,306  
Employer contributions 79,625 82,999  
Benefits Paid (77,417) (81,331)  
Fair value of assets at end of year 1,205,668 1,041,592 959,618
Funded status (375,088) (412,718)  
Amounts recognized in the balance sheet      
Non-current liabilities (375,088) (412,718)  
Amounts recognized as a regulatory asset      
Net loss 706,783 701,774  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy Arkansas [Member] | Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 258,787 258,900  
Service cost 3,451 3,913 6,957
Interest cost 9,020 9,297 12,518
Plan amendments   (1,007)  
Actuarial (gain)/loss (11,691) 2,453  
Employee contributions 7,875 6,330  
Benefits Paid (18,497) (21,178)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 74 79  
Balance at end of year 249,019 258,787 258,900
Change in Plan Assets      
Fair value of assets at beginning of year 250,926 243,206  
Actual return on plan assets 33,679 16,977  
Employer contributions 695 5,591  
Employee contributions 7,875 6,330  
Benefits Paid (18,497) (21,178)  
Fair value of assets at end of year 274,678 250,926 243,206
Funded status 25,659 (7,861)  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Non-current liabilities 25,659 (7,861)  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 16,574 21,684  
Net loss 42,394 76,388  
Amortization of prior service credit (5,110) (5,472) (2,441)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 25,820 54,704  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Amount recognized as AOCI (before tax) 0 0  
Entergy Louisiana [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (748,384) (780,278)  
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 1,624,233 1,564,710  
Service cost 27,698 28,194  
Interest cost 59,235 59,478  
Actuarial (gain)/loss 147,704 48,357  
Benefits Paid (73,170) (76,506)  
Balance at end of year 1,785,700 1,624,233 1,564,710
Change in Plan Assets      
Fair value of assets at beginning of year 1,169,147 1,071,234  
Actual return on plan assets 182,261 89,998  
Employer contributions 87,503 84,421  
Benefits Paid (73,170) (76,506)  
Fair value of assets at end of year 1,365,741 1,169,147 1,071,234
Funded status (419,959) (455,086)  
Amounts recognized in the balance sheet      
Non-current liabilities (419,959) (455,086)  
Amounts recognized as a regulatory asset      
Net loss 701,324 686,337  
Amounts recognized as AOCI (before tax)      
Net loss 44,765 51,660  
Entergy Louisiana [Member] | Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 342,500 356,253  
Service cost 6,373 7,476 9,893
Interest cost 12,101 13,041 16,311
Plan amendments   (4,647)  
Actuarial (gain)/loss (1,256) (13,117)  
Employee contributions 7,855 6,273  
Benefits Paid (22,273) (22,893)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 89 114  
Balance at end of year 345,389 342,500 356,253
Change in Plan Assets      
Fair value of assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 14,418 16,620  
Employee contributions 7,855 6,273  
Benefits Paid (22,273) (22,893)  
Fair value of assets at end of year 0 0 0
Funded status (345,389) (342,500)  
Amounts recognized in the balance sheet      
Current liabilities (18,794) (19,209)  
Non-current liabilities (326,595) (323,291)  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 0 0  
Net loss 0 0  
Amortization of prior service credit (7,735) (7,787) (7,467)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 0 0  
Amounts recognized as AOCI (before tax)      
Prior service cost (19,999) (27,735)  
Net loss 51,585 54,700  
Amount recognized as AOCI (before tax) 31,586 26,965  
Entergy Mississippi [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (101,498) (109,551)  
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 419,201 408,604  
Service cost 5,890 6,250  
Interest cost 14,927 15,245  
Actuarial (gain)/loss 38,726 11,343  
Benefits Paid (21,195) (22,241)  
Balance at end of year 457,549 419,201 408,604
Change in Plan Assets      
Fair value of assets at beginning of year 314,349 292,297  
Actual return on plan assets 48,572 24,325  
Employer contributions 19,116 19,968  
Benefits Paid (21,195) (22,241)  
Fair value of assets at end of year 360,842 314,349 292,297
Funded status (96,707) (104,852)  
Amounts recognized in the balance sheet      
Non-current liabilities (96,707) (104,852)  
Amounts recognized as a regulatory asset      
Net loss 191,877 189,409  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy Mississippi [Member] | Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 78,485 77,382  
Service cost 1,160 1,543 2,028
Interest cost 2,759 2,835 3,436
Plan amendments   (6,219)  
Actuarial (gain)/loss 5,858 8,230  
Employee contributions 2,160 1,721  
Benefits Paid (5,823) (7,031)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 22 24  
Balance at end of year 84,621 78,485 77,382
Change in Plan Assets      
Fair value of assets at beginning of year 75,945 75,538  
Actual return on plan assets 10,153 5,032  
Employer contributions (2) 685  
Employee contributions 2,160 1,721  
Benefits Paid (5,823) (7,031)  
Fair value of assets at end of year 82,433 75,945 75,538
Funded status (2,188) (2,540)  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Non-current liabilities (2,188) (2,540)  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 6,687 8,511  
Net loss 25,247 26,416  
Amortization of prior service credit (1,823) (934) (916)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 18,560 17,905  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Amount recognized as AOCI (before tax) 0 0  
Entergy New Orleans [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (20,755) (36,750)  
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 197,464 191,064  
Service cost 2,500 2,625  
Interest cost 7,163 7,256  
Actuarial (gain)/loss 19,507 5,573  
Benefits Paid (8,738) (9,054)  
Balance at end of year 217,896 197,464 191,064
Change in Plan Assets      
Fair value of assets at beginning of year 142,488 129,975  
Actual return on plan assets 22,104 10,858  
Employer contributions 9,893 10,709  
Benefits Paid (8,738) (9,054)  
Fair value of assets at end of year 165,747 142,488 129,975
Funded status (52,149) (54,976)  
Amounts recognized in the balance sheet      
Non-current liabilities (52,149) (54,976)  
Amounts recognized as a regulatory asset      
Net loss 96,913 94,944  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy New Orleans [Member] | Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 55,515 51,951  
Service cost 567 622 818
Interest cost 1,874 1,791 2,608
Plan amendments   0  
Actuarial (gain)/loss (899) 4,774  
Employee contributions 1,151 1,213  
Benefits Paid (4,670) (4,852)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 10 16  
Balance at end of year 53,548 55,515 51,951
Change in Plan Assets      
Fair value of assets at beginning of year 74,236 69,881  
Actual return on plan assets 11,078 3,674  
Employer contributions 3,709 4,320  
Employee contributions 1,151 1,213  
Benefits Paid (4,670) (4,852)  
Fair value of assets at end of year 85,504 74,236 69,881
Funded status 31,956 18,721  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Non-current liabilities 31,956 18,721  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 1,427 2,172  
Net loss 4,269 12,029  
Amortization of prior service credit (745) (745) (709)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 2,842 9,857  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Amount recognized as AOCI (before tax) 0 0  
Entergy Texas [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (17,853) (67,313)  
Entergy Texas [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 386,366 383,627  
Service cost 5,455 5,664  
Interest cost 13,569 14,228  
Actuarial (gain)/loss 25,339 4,274  
Benefits Paid (20,009) (21,427)  
Balance at end of year 410,720 386,366 383,627
Change in Plan Assets      
Fair value of assets at beginning of year 317,576 298,378  
Actual return on plan assets 48,952 24,705  
Employer contributions 17,004 15,920  
Benefits Paid (20,009) (21,427)  
Fair value of assets at end of year 363,523 317,576 298,378
Funded status (47,197) (68,790)  
Amounts recognized in the balance sheet      
Non-current liabilities (47,197) (68,790)  
Amounts recognized as a regulatory asset      
Net loss 145,412 153,544  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy Texas [Member] | Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 127,700 114,582  
Service cost 1,488 1,590 2,000
Interest cost 4,494 4,154 5,366
Plan amendments   0  
Actuarial (gain)/loss (12,469) 12,389  
Employee contributions 2,453 1,927  
Benefits Paid (6,980) (6,977)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 16 35  
Balance at end of year 116,702 127,700 114,582
Change in Plan Assets      
Fair value of assets at beginning of year 137,069 130,374  
Actual return on plan assets 18,506 8,586  
Employer contributions 3,123 3,159  
Employee contributions 2,453 1,927  
Benefits Paid (6,980) (6,977)  
Fair value of assets at end of year 154,171 137,069 130,374
Funded status 37,469 9,369  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Non-current liabilities 37,469 9,369  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 5,980 8,296  
Net loss 24,478 50,036  
Amortization of prior service credit (2,316) (2,722) (2,723)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 18,498 41,740  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Amount recognized as AOCI (before tax) 0 0  
System Energy [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (121,874) (117,850)  
System Energy [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 335,381 311,542  
Service cost 6,145 6,263  
Interest cost 12,364 11,966  
Actuarial (gain)/loss 45,471 20,661  
Benefits Paid (15,312) (15,051)  
Balance at end of year 384,049 335,381 311,542
Change in Plan Assets      
Fair value of assets at beginning of year 235,144 212,006  
Actual return on plan assets 36,387 17,692  
Employer contributions 18,213 20,497  
Benefits Paid (15,312) (15,051)  
Fair value of assets at end of year 274,432 235,144 212,006
Funded status (109,617) (100,237)  
Amounts recognized in the balance sheet      
Non-current liabilities (109,617) (100,237)  
Amounts recognized as a regulatory asset      
Net loss 185,774 169,897  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
System Energy [Member] | Other Postretirement Benefit Plan [Member]      
Change in APBO      
Balance at beginning of year 62,498 57,645  
Service cost 1,278 1,337 1,881
Interest cost 2,236 2,117 2,511
Plan amendments   0  
Actuarial (gain)/loss (2,233) 4,806  
Employee contributions 1,779 1,390  
Benefits Paid (4,205) (4,818)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received 28 21  
Balance at end of year 61,381 62,498 57,645
Change in Plan Assets      
Fair value of assets at beginning of year 44,885 44,917  
Actual return on plan assets 6,095 3,066  
Employer contributions 570 330  
Employee contributions 1,779 1,390  
Benefits Paid (4,205) (4,818)  
Fair value of assets at end of year 49,124 44,885 44,917
Funded status (12,257) (17,613)  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Non-current liabilities (12,257) (17,613)  
Amounts recognized as a regulatory asset      
Prior service cost/(credit) 3,819 5,332  
Net loss 16,386 23,405  
Amortization of prior service credit (1,513) (1,570) $ (1,465)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized 12,567 18,073  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Amount recognized as AOCI (before tax) $ 0 $ 0