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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in the balance sheet      
Current liabilities $ (61,815) $ (66,184)  
Non-current liabilities (2,853,013) (2,798,265)  
Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 1,252,903 1,232,619  
Service cost 24,500 18,699 $ 27,129
Interest cost 28,597 47,901 50,725
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment (128,837) 0  
Actuarial (gain)/loss 80,162 23,673  
Employee contributions 37,176 38,640  
Benefits Paid (113,786) (109,223)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 360 594  
Balance at end of year 1,181,075 1,252,903 1,232,619
Change in Plan Assets      
Fair value of assets at beginning of year 686,262 609,782  
Actual return on plan assets 80,011 100,445  
Employer contributions 48,203 46,618  
Employee contributions 37,176 38,640  
Benefits Paid (113,786) (109,223)  
Fair value of assets at end of year 737,866 686,262 609,782
Funded status (443,209) (566,641)  
Amounts recognized in the balance sheet      
Current liabilities (38,963) (48,040)  
Non-current liabilities (404,246) (518,601)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax (45,501) (11,899)  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax 8,565 5,081  
Defined Benefit Plan Regulatory Liability Before Tax (54,066) (16,980)  
Amounts recognized as AOCI (before tax)      
Prior service cost (83,581) (21,231)  
Net loss 24,365 (16,670)  
Accumulated other comprehensive income (before taxes) (59,216) (37,901)  
Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 8,406,203 7,404,917  
Service cost 161,487 134,193  
Interest cost 239,614 293,114  
Actuarial (gain)/loss 969,609 1,292,767  
Benefits Paid (633,261) (718,788)  
Balance at end of year 9,143,652 8,406,203 7,404,917
Change in Plan Assets      
Fair value of assets at beginning of year 6,271,160 5,497,415  
Actual return on plan assets 900,229 1,093,114  
Employer contributions 316,298 399,419  
Benefits Paid (633,261) (718,788)  
Fair value of assets at end of year 6,854,426 6,271,160 5,497,415
Funded status (2,289,226) (2,135,043)  
Amounts recognized in the balance sheet      
Non-current liabilities (2,289,226) (2,135,043)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (2,926,670) (2,831,408)  
Amounts recognized as AOCI (before tax)      
Net loss 726,010 724,575  
Entergy Arkansas [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (361,682) (319,075)  
Entergy Arkansas [Member] | Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 185,744 187,830  
Service cost 3,626 2,363 3,170
Interest cost 4,712 7,226 7,986
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment 12,320    
Actuarial (gain)/loss 18,257 166  
Employee contributions 7,792 8,125  
Benefits Paid (23,141) (20,048)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 59 82  
Balance at end of year 209,369 185,744 187,830
Change in Plan Assets      
Fair value of assets at beginning of year 284,224 252,055  
Actual return on plan assets 33,116 42,835  
Employer contributions 2,201 1,257  
Employee contributions 7,792 8,125  
Benefits Paid (23,141) (20,048)  
Fair value of assets at end of year 304,192 284,224 252,055
Funded status 94,823 98,480  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Assets for Plan Benefits, Defined Benefit Plan 94,823 98,480  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax 7,655 (6,515)  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax 16,557 18,262  
Defined Benefit Plan Regulatory Liability Before Tax (8,902) (24,777)  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Accumulated other comprehensive income (before taxes) 0 0  
Entergy Arkansas [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 1,615,084 1,443,808  
Service cost 26,329 21,043  
Interest cost 44,165 56,701  
Actuarial (gain)/loss 196,755 248,213  
Benefits Paid (142,951) (154,681)  
Balance at end of year 1,739,382 1,615,084 1,443,808
Change in Plan Assets      
Fair value of assets at beginning of year 1,200,035 1,068,842  
Actual return on plan assets 168,764 210,020  
Employer contributions 60,008 75,854  
Benefits Paid (142,951) (154,681)  
Fair value of assets at end of year 1,285,856 1,200,035 1,068,842
Funded status (453,526) (415,049)  
Amounts recognized in the balance sheet      
Non-current liabilities (453,526) (415,049)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (816,002) (799,235)  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy Louisiana [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (692,728) (677,619)  
Entergy Louisiana [Member] | Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 274,175 275,269  
Service cost 5,993 4,639 6,225
Interest cost 6,216 10,664 11,154
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment (23,508)    
Actuarial (gain)/loss 8,744 (2,220)  
Employee contributions 8,269 8,876  
Benefits Paid (24,395) (23,160)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 77 107  
Balance at end of year 255,571 274,175 275,269
Change in Plan Assets      
Fair value of assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 16,126 14,284  
Employee contributions 8,269 8,876  
Benefits Paid (24,395) (23,160)  
Fair value of assets at end of year 0 0 0
Funded status (255,571) (274,175)  
Amounts recognized in the balance sheet      
Current liabilities (15,580) (18,467)  
Non-current liabilities (239,991) (255,708)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax 0 0  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax 0 0  
Amounts recognized as AOCI (before tax)      
Prior service cost (22,244) (4,915)  
Net loss (15,548) (24,739)  
Accumulated other comprehensive income (before taxes) (37,792) (29,654)  
Entergy Louisiana [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 1,784,474 1,599,916  
Service cost 35,158 29,137  
Interest cost 50,432 63,529  
Actuarial (gain)/loss 196,032 248,509  
Benefits Paid (138,825) (156,617)  
Balance at end of year 1,927,271 1,784,474 1,599,916
Change in Plan Assets      
Fair value of assets at beginning of year 1,364,030 1,215,926  
Actual return on plan assets 195,658 239,770  
Employer contributions 55,443 64,951  
Benefits Paid (138,825) (156,617)  
Fair value of assets at end of year 1,476,306 1,364,030 1,215,926
Funded status (450,965) (420,444)  
Amounts recognized in the balance sheet      
Non-current liabilities (450,965) (420,444)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (766,099) (759,228)  
Amounts recognized as AOCI (before tax)      
Net loss 31,921 23,481  
Entergy Mississippi [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (110,901) (99,406)  
Entergy Mississippi [Member] | Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 65,979 68,976  
Service cost 1,468 1,046 1,284
Interest cost 1,536 2,681 2,731
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment (4,428)    
Actuarial (gain)/loss 684 (3,778)  
Employee contributions 2,122 2,197  
Benefits Paid (5,382) (5,159)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 11 16  
Balance at end of year 61,990 65,979 68,976
Change in Plan Assets      
Fair value of assets at beginning of year 86,085 75,853  
Actual return on plan assets 10,307 12,966  
Employer contributions 343 228  
Employee contributions 2,122 2,197  
Benefits Paid (5,382) (5,159)  
Fair value of assets at end of year 93,475 86,085 75,853
Funded status 31,485 20,106  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Assets for Plan Benefits, Defined Benefit Plan 31,485 20,106  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax (5,884) (3,108)  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax 1,355 (3,272)  
Defined Benefit Plan Regulatory Liability Before Tax (7,239)    
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Accumulated other comprehensive income (before taxes) 0 0  
Entergy Mississippi [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 471,510 414,089  
Service cost 8,060 6,516  
Interest cost 12,922 16,272  
Actuarial (gain)/loss 62,564 79,453  
Benefits Paid (44,947) (44,820)  
Balance at end of year 510,109 471,510 414,089
Change in Plan Assets      
Fair value of assets at beginning of year 354,928 316,716  
Actual return on plan assets 48,812 62,238  
Employer contributions 12,601 20,794  
Benefits Paid (44,947) (44,820)  
Fair value of assets at end of year 371,394 354,928 316,716
Funded status (138,715) (116,582)  
Amounts recognized in the balance sheet      
Non-current liabilities (138,715) (116,582)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (239,904) (225,354)  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy New Orleans [Member] | Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 38,460 41,987  
Service cost 445 367 516
Interest cost 784 1,581 1,669
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment (5,493)    
Actuarial (gain)/loss (91) (4,234)  
Employee contributions 1,123 1,343  
Benefits Paid (3,530) (2,598)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 9 14  
Balance at end of year 31,707 38,460 41,987
Change in Plan Assets      
Fair value of assets at beginning of year 93,858 81,774  
Actual return on plan assets 10,642 11,680  
Employer contributions 641 1,659  
Employee contributions 1,123 1,343  
Benefits Paid (3,530) (2,598)  
Fair value of assets at end of year 102,734 93,858 81,774
Funded status 71,027 55,398  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Assets for Plan Benefits, Defined Benefit Plan 71,027 55,398  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax (4,730) 0  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax 13,385 8,046  
Defined Benefit Plan Regulatory Liability Before Tax (18,115) (8,046)  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Accumulated other comprehensive income (before taxes) 0 0  
Entergy New Orleans [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 206,962 191,190  
Service cost 2,654 2,274  
Interest cost 5,825 7,495  
Actuarial (gain)/loss 20,535 24,299  
Benefits Paid (15,689) (18,296)  
Balance at end of year 220,287 206,962 191,190
Change in Plan Assets      
Fair value of assets at beginning of year 160,777 145,968  
Actual return on plan assets 22,896 28,552  
Employer contributions 4,567 4,553  
Benefits Paid (15,689) (18,296)  
Fair value of assets at end of year 172,551 160,777 145,968
Funded status (47,736) (46,185)  
Amounts recognized in the balance sheet      
Non-current liabilities (47,736) (46,185)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (91,991) (91,862)  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
Entergy Texas [Member] | Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 94,742 88,310  
Service cost 1,219 943 1,319
Interest cost 2,008 3,415 3,754
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment (22,441)    
Actuarial (gain)/loss 5,952 8,279  
Employee contributions 2,456 2,602  
Benefits Paid (9,721) (8,830)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 18 23  
Balance at end of year 74,233 94,742 88,310
Change in Plan Assets      
Fair value of assets at beginning of year 161,810 144,846  
Actual return on plan assets 18,861 23,788  
Employer contributions 690    
Defined Benefit Plan Refund to Employer   (596)  
Employee contributions 2,456 2,602  
Benefits Paid (9,721) (8,830)  
Fair value of assets at end of year 174,096 161,810 144,846
Funded status 99,863 67,068  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Assets for Plan Benefits, Defined Benefit Plan 99,863 67,068  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax (20,498) (1,422)  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (2,030) (6,203)  
Defined Benefit Plan Regulatory Liability Before Tax (18,468)    
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Accumulated other comprehensive income (before taxes) 0 0  
Entergy Texas [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 396,764 369,604  
Service cost 6,116 5,401  
Interest cost 10,731 14,451  
Actuarial (gain)/loss 37,579 49,235  
Benefits Paid (40,526) (41,927)  
Balance at end of year 410,664 396,764 369,604
Change in Plan Assets      
Fair value of assets at beginning of year 339,126 315,514  
Actual return on plan assets 46,151 61,814  
Employer contributions 4,997 3,725  
Benefits Paid (40,526) (41,927)  
Fair value of assets at end of year 349,748 339,126 315,514
Funded status (60,916) (57,638)  
Amounts recognized in the balance sheet      
Non-current liabilities (60,916) (57,638)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (156,480) (160,564)  
Amounts recognized as AOCI (before tax)      
Net loss 0 0  
System Energy [Member]      
Amounts recognized in the balance sheet      
Non-current liabilities (125,412) (109,816)  
System Energy [Member] | Other Postretirement Benefits Plan [Member]      
Change in APBO      
Balance at beginning of year 47,348 48,791  
Service cost 1,254 973 1,223
Interest cost 1,130 1,902 1,998
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment (1,963)    
Actuarial (gain)/loss 3,025 (891)  
Employee contributions 1,732 1,765  
Benefits Paid (4,851) (5,229)  
Defined Benefit Plan, Gross Prescription Drug Subsidy Receipts Received (Deprecated 2017-01-31) 26 37  
Balance at end of year 47,701 47,348 48,791
Change in Plan Assets      
Fair value of assets at beginning of year 48,471 43,670  
Actual return on plan assets 5,925 7,436  
Employer contributions 1,342 829  
Employee contributions 1,732 1,765  
Benefits Paid (4,851) (5,229)  
Fair value of assets at end of year 52,619 48,471 43,670
Funded status 4,918 1,123  
Amounts recognized in the balance sheet      
Current liabilities 0 0  
Assets for Plan Benefits, Defined Benefit Plan 4,918 1,123  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan Regulatory Asset Net Prior Service Cost (Credit) Before Tax (1,754) (854)  
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (2,818) (2,881)  
Amounts recognized as AOCI (before tax)      
Prior service cost 0 0  
Net loss 0 0  
Accumulated other comprehensive income (before taxes) 0 0  
System Energy [Member] | Qualified Pension Obligations [Member]      
Change in APBO      
Balance at beginning of year 393,607 339,034  
Service cost 7,883 6,199  
Interest cost 11,006 13,456  
Actuarial (gain)/loss 57,574 66,460  
Benefits Paid (28,922) (31,542)  
Balance at end of year 441,148 393,607 339,034
Change in Plan Assets      
Fair value of assets at beginning of year 282,668 245,516  
Actual return on plan assets 40,927 48,460  
Employer contributions 16,145 20,234  
Benefits Paid (28,922) (31,542)  
Fair value of assets at end of year 310,818 282,668 $ 245,516
Funded status (130,330) (110,939)  
Amounts recognized in the balance sheet      
Non-current liabilities (130,330) (110,939)  
Amounts recognized as a regulatory asset (before tax) [Abstract]      
Defined Benefit Plan, Regulatory Asset, Gain (Loss) before Tax (212,062) (193,870)  
Amounts recognized as AOCI (before tax)      
Net loss $ 0 $ 0