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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Operating revenues $ 14,779 $ 13,728 $ 12,077
Depreciation and amortization: (1,502) (1,596) (1,753)
Operating income (loss): 2,661 (1,177) (1,515)
Interest expense and related charges: (740) (368) (384)
Income tax (expense) benefit: (508) 350 458
Net income (loss) 1,492 (1,210) (1,264)
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 751 596 398
Corporate and Other      
Segment Reporting Information [Line Items]      
Operating revenues 2 1 0
Depreciation and amortization: (68) (69) (36)
Operating income (loss): (193) (135) (83)
Interest expense and related charges: (742) (371) (381)
Income tax (expense) benefit: (507) 350 460
Net income (loss) (1,527) (270) 53
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 58 55 48
Eliminations      
Segment Reporting Information [Line Items]      
Operating revenues (6,578) (4,755) (2,284)
Depreciation and amortization: 0 0 0
Operating income (loss): 0 0 0
Interest expense and related charges: 0 0 1
Income tax (expense) benefit: 0 0 0
Net income (loss) 0 0 0
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 0 0 0
Retail | Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 10,572 9,455 7,871
Depreciation and amortization: (102) (145) (212)
Operating income (loss): 443 1,172 2,213
Interest expense and related charges: (20) (14) (9)
Income tax (expense) benefit: 0 0 (2)
Net income (loss) 424 1,158 2,196
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 1 1 1
Texas | Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 3,823 3,733 2,790
Depreciation and amortization: (544) (537) (608)
Operating income (loss): 300 (711) (2,601)
Interest expense and related charges: 21 20 14
Income tax (expense) benefit: 0 0 0
Net income (loss) 354 (615) (2,512)
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 500 335 266
East | Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 4,215 3,706 2,587
Depreciation and amortization: (647) (706) (698)
Operating income (loss): 1,158 (867) (552)
Interest expense and related charges: 0 (3) (15)
Income tax (expense) benefit: (1) 0 0
Net income (loss) 1,160 (868) (567)
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 105 56 44
West | Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 914 336 374
Depreciation and amortization: (79) (42) (60)
Operating income (loss): 425 (250) (8)
Interest expense and related charges: 8 6 9
Income tax (expense) benefit: 0 0 0
Net income (loss) 454 (238) 1
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 18 116 8
Sunset | Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 1,831 868 661
Depreciation and amortization: (62) (66) (94)
Operating income (loss): 639 (228) (67)
Interest expense and related charges: (2) (3) (3)
Income tax (expense) benefit: 0 0 0
Net income (loss) 633 (230) (61)
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: 69 33 28
Asset Closure | Operating Segments      
Segment Reporting Information [Line Items]      
Operating revenues 0 384 78
Depreciation and amortization: 0 (31) (45)
Operating income (loss): (111) (158) (417)
Interest expense and related charges: (5) (3) 0
Income tax (expense) benefit: 0 0 0
Net income (loss) (6) (147) (374)
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures: $ 0 $ 0 $ 3