v3.26.1
Retirement And Other Postretirement Benefits (Schedule of Net Benefit Costs) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Plan [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost $ 23,078,000 $ 23,617,000 $ 46,156,000 $ 47,234,000
Defined Benefit Plan, Interest Cost 56,047,000 59,680,000 112,094,000 119,360,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (76,536,000) (75,280,000) (153,072,000) (150,560,000)
Defined Benefit Plan, Amortization of Gain (Loss) 13,956,000 13,309,000 27,912,000 26,618,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 16,545,000 21,326,000 33,090,000 42,652,000
Pension Plan [Member] | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 2,400,000 2,500,000 4,800,000 5,000,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Pension Plan [Member] | Entergy Arkansas [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 4,363,000 4,427,000 8,726,000 8,854,000
Defined Benefit Plan, Interest Cost 12,796,000 13,814,000 25,592,000 27,628,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (17,825,000) (17,676,000) (35,650,000) (35,352,000)
Defined Benefit Plan, Amortization of Gain (Loss) 4,782,000 4,791,000 9,564,000 9,582,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 4,116,000 5,356,000 8,232,000 10,712,000
Pension Plan [Member] | Entergy Arkansas [Member] | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 13,000 47,000 26,000 94,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Pension Plan [Member] | Entergy Louisiana [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 5,320,000 5,454,000 10,640,000 10,908,000
Defined Benefit Plan, Interest Cost 13,411,000 14,704,000 26,822,000 29,408,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (18,908,000) (18,897,000) (37,816,000) (37,794,000)
Defined Benefit Plan, Amortization of Gain (Loss) 2,159,000 2,268,000 4,318,000 4,536,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 1,982,000 3,529,000 3,964,000 7,058,000
Pension Plan [Member] | Entergy Louisiana [Member] | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 61,000 36,000 122,000 72,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Pension Plan [Member] | Entergy Mississippi [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 1,296,000 1,304,000 2,592,000 2,608,000
Defined Benefit Plan, Interest Cost 3,434,000 3,699,000 6,868,000 7,398,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (4,945,000) (4,949,000) (9,890,000) (9,898,000)
Defined Benefit Plan, Amortization of Gain (Loss) 871,000 822,000 1,742,000 1,644,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 656,000 876,000 1,312,000 1,752,000
Pension Plan [Member] | Entergy Mississippi [Member] | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 62,000 90,000 101,000 180,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Pension Plan [Member] | Entergy New Orleans [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 265,000 411,000 530,000 822,000
Defined Benefit Plan, Interest Cost 1,191,000 1,647,000 2,382,000 3,294,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1,669,000) (2,174,000) (3,338,000) (4,348,000)
Defined Benefit Plan, Amortization of Gain (Loss) 464,000 415,000 928,000 830,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 251,000 299,000 502,000 598,000
Pension Plan [Member] | Entergy New Orleans [Member] | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 34,000 35,000 69,000 70,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Pension Plan [Member] | Entergy Texas [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 1,011,000 1,024,000 2,022,000 2,048,000
Defined Benefit Plan, Interest Cost 2,660,000 2,973,000 5,320,000 5,946,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (3,779,000) (3,889,000) (7,558,000) (7,778,000)
Defined Benefit Plan, Amortization of Gain (Loss) 489,000 454,000 978,000 908,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 381,000 562,000 762,000 1,124,000
Pension Plan [Member] | Entergy Texas [Member] | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 123,000 39,000 246,000 78,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0 0
Pension Plan [Member] | System Energy [Member] | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 1,326,000 1,372,000 2,652,000 2,744,000
Defined Benefit Plan, Interest Cost 3,316,000 3,585,000 6,632,000 7,170,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (4,684,000) (4,575,000) (9,368,000) (9,150,000)
Defined Benefit Plan, Amortization of Gain (Loss) 1,148,000 1,114,000 2,296,000 2,228,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 1,106,000 1,496,000 2,212,000 2,992,000
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 2,694,000 2,757,000 5,388,000 5,514,000
Defined Benefit Plan, Interest Cost 9,597,000 9,690,000 19,194,000 19,380,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (10,314,000) (10,209,000) (20,628,000) (20,418,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1,585,000) (5,720,000) (3,170,000) (11,440,000)
Defined Benefit Plan, Amortization of Gain (Loss) (2,877,000) (3,870,000) 1,803,000 (7,740,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (2,485,000) (7,352,000) 2,587,000 (14,704,000)
Other Postretirement Benefits Plan [Member] | Entergy Arkansas [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 551,000 572,000 1,102,000 1,144,000
Defined Benefit Plan, Interest Cost 1,766,000 1,775,000 3,532,000 3,550,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (4,374,000) (4,225,000) (8,748,000) (8,450,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 174,000 524,000 348,000 1,048,000
Defined Benefit Plan, Amortization of Gain (Loss) (475,000) (353,000) (950,000) (706,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (2,358,000) (1,707,000) (4,716,000) (3,414,000)
Other Postretirement Benefits Plan [Member] | Entergy Louisiana [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 688,000 671,000 1,376,000 1,342,000
Defined Benefit Plan, Interest Cost 2,039,000 2,012,000 4,078,000 4,024,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (309,000) (1,136,000) (618,000) (2,272,000)
Defined Benefit Plan, Amortization of Gain (Loss) (1,098,000) (1,811,000) (2,196,000) (3,622,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 1,320,000 (264,000) 2,640,000 (528,000)
Other Postretirement Benefits Plan [Member] | Entergy Mississippi [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 159,000 162,000 318,000 324,000
Defined Benefit Plan, Interest Cost 487,000 489,000 974,000 978,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1,374,000) (1,328,000) (2,748,000) (2,656,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (85,000) (239,000) (170,000) (478,000)
Defined Benefit Plan, Amortization of Gain (Loss) (73,000) (57,000) (146,000) (114,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (886,000) (973,000) (1,772,000) (1,946,000)
Other Postretirement Benefits Plan [Member] | Entergy New Orleans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 35,000 52,000 70,000 104,000
Defined Benefit Plan, Interest Cost 182,000 249,000 364,000 498,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1,258,000) (1,445,000) (2,516,000) (2,890,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 (229,000) 0 (458,000)
Defined Benefit Plan, Amortization of Gain (Loss) (137,000) (27,000) (274,000) (54,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (1,178,000) (1,400,000) (2,356,000) (2,800,000)
Other Postretirement Benefits Plan [Member] | Entergy Texas [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 129,000 159,000 258,000 318,000
Defined Benefit Plan, Interest Cost 495,000 582,000 990,000 1,164,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (2,528,000) (2,452,000) (5,056,000) (4,904,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (604,000) (1,093,000) (1,208,000) (2,186,000)
Defined Benefit Plan, Amortization of Gain (Loss) 97,000 153,000 194,000 306,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (2,411,000) (2,651,000) (4,822,000) (5,302,000)
Other Postretirement Benefits Plan [Member] | System Energy [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 186,000 174,000 372,000 348,000
Defined Benefit Plan, Interest Cost 419,000 394,000 838,000 788,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (722,000) (702,000) (1,444,000) (1,404,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 9,000 (73,000) 18,000 (146,000)
Defined Benefit Plan, Amortization of Gain (Loss) 45,000 (7,000) 90,000 (14,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ (63,000) $ (214,000) $ (126,000) $ (428,000)