v3.26.1
Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]            
Operating revenues $ 4,017   $ 4,250   $ 9,657 $ 8,183
Fuel, purchased power costs, and delivery fees (1,774)   (1,974)   (4,304) (4,421)
Operating costs (853)   (733)   (1,553) (1,426)
Selling, general, and administrative expenses (392)   (419)   (819) (810)
Depreciation and amortization (445)   (541)   (929) (1,063)
Interest expenses and related charges (312)   (303)   (575) (622)
Net income 305 $ 1,029 327 $ (268) 1,334 59
Income tax (expense) benefit (122)   (76)   (305) 100
Net income (loss) before income taxes 427   403   1,639 (41)
Total capital expenditures, including nuclear fuel and excluding growth expenditures         1,054 1,286
Operating Segments            
Segment Reporting [Line Items]            
Operating revenues 6,053   6,845   15,084 11,764
Fuel, purchased power costs, and delivery fees    
Operating costs    
Interest expenses and related charges    
Net income 822   767   2,379 698
Total capital expenditures, including nuclear fuel and excluding growth expenditures         739 957
Corporate and Other            
Segment Reporting [Line Items]            
Operating revenues (2,036)   (2,595)   (5,427) (3,581)
Net income (517)   (440)   (1,045) (639)
Income tax (expense) benefit (122)   (76)   (305) 100
Total capital expenditures, including nuclear fuel and excluding growth expenditures         315 329
Retail | Operating Segments            
Segment Reporting [Line Items]            
Operating revenues 3,610   3,532   7,299 6,700
Fuel, purchased power costs, and delivery fees (2,838)   (3,321)   (6,935) (5,033)
Operating costs (37)   (37)   (75) (77)
Selling, general, and administrative expenses (231)   (256)   (487) (499)
Depreciation and amortization (10)   (24)   (20) (47)
Interest expenses and related charges (10)   (17)   (23) (35)
Other 0   0   1 0
Net income 484   (123)   (240) 1,009
Total capital expenditures, including nuclear fuel and excluding growth expenditures         7 8
Texas            
Segment Reporting [Line Items]            
Amortization of nuclear fuel 30   30   66 61
Texas | Operating Segments            
Segment Reporting [Line Items]            
Operating revenues 1,418   1,788   4,405 1,998
Fuel, purchased power costs, and delivery fees (363)   (468)   (779) (965)
Operating costs (293)   (277)   (554) (535)
Selling, general, and administrative expenses (45)   (43)   (104) (84)
Depreciation and amortization (184)   (167)   (358) (317)
Interest expenses and related charges 10   18   24 32
Other 49   12   49 14
Net income 592   863   2,683 143
Total capital expenditures, including nuclear fuel and excluding growth expenditures         380 577
East            
Segment Reporting [Line Items]            
Amortization of nuclear fuel 86   92   176 176
East | Operating Segments            
Segment Reporting [Line Items]            
Operating revenues 954   1,480   3,214 2,860
Fuel, purchased power costs, and delivery fees (594)   (746)   (1,978) (1,918)
Operating costs (410)   (355)   (783) (682)
Selling, general, and administrative expenses (44)   (58)   (94) (116)
Depreciation and amortization (216)   (316)   (481) (632)
Interest expenses and related charges 24   8   46 20
Other 120   107   86 98
Net income (166)   120   10 (370)
Total capital expenditures, including nuclear fuel and excluding growth expenditures         305 303
West | Operating Segments            
Segment Reporting [Line Items]            
Operating revenues 71   25   160 182
Fuel, purchased power costs, and delivery fees (15)   (35)   (40) (87)
Operating costs (16)   (18)   (32) (30)
Selling, general, and administrative expenses (2)   (7)   (5) (9)
Depreciation and amortization (14)   (16)   (28) (31)
Interest expenses and related charges 4   1   7 2
Other 0   0   0 0
Net income 28   (50)   62 27
Total capital expenditures, including nuclear fuel and excluding growth expenditures         47 69
Asset Closure            
Segment Reporting [Line Items]            
Operating revenues           24
Asset Closure | Operating Segments            
Segment Reporting [Line Items]            
Operating revenues 0   20   6 24
Fuel, purchased power costs, and delivery fees 0   0   0 0
Operating costs (97)   (45)   (109) (101)
Selling, general, and administrative expenses (16)   (19)   (31) (36)
Depreciation and amortization (3)   1   (6) 2
Interest expenses and related charges (1)   (1)   (1) (2)
Other 1   1   5 2
Net income $ (116)   $ (43)   (136) (111)
Total capital expenditures, including nuclear fuel and excluding growth expenditures         $ 0 $ 0