v3.25.2
Segment Information - Generation Total Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenues from contracts with customers $ 5,161 $ 4,406 $ 11,267 $ 9,663
Other revenues 940 1,069 1,622 1,974
Total Operating revenues 6,101 5,475 12,889 11,637
Total Purchased power and fuel expenses (3,132) (2,292) (7,516) (5,709)
Total RNF 2,969 3,183 5,373 5,928
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 4,735 4,050 10,004 8,569
Other revenues 414 477 730 752
Total Operating revenues 5,149 4,527 10,734 9,321
Total Purchased power and fuel expenses (2,482) (2,122) (5,599) (4,617)
Total RNF 2,667 2,405 5,135 4,704
Operating Segments | Mid-Atlantic        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 1,435 1,297 3,041 2,652
Other revenues 13 7 72 (106)
Total Operating revenues 1,448 1,304 3,113 2,546
Total Purchased power and fuel expenses (666) (544) (1,522) (1,111)
Total RNF 782 760 1,591 1,435
Operating Segments | Midwest        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 1,428 993 2,738 1,993
Other revenues 96 175 190 269
Total Operating revenues 1,524 1,168 2,928 2,262
Total Purchased power and fuel expenses (488) (403) (1,042) (794)
Total RNF 1,036 765 1,886 1,468
Operating Segments | New York        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 514 463 1,189 955
Other revenues 21 51 (92) 72
Total Operating revenues 535 514 1,097 1,027
Total Purchased power and fuel expenses (138) (141) (299) (310)
Total RNF 397 373 798 717
Operating Segments | ERCOT        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 328 274 630 511
Other revenues 136 83 232 167
Total Operating revenues 464 357 862 678
Total Purchased power and fuel expenses (193) (143) (377) (254)
Total RNF 271 214 485 424
Operating Segments | Other Power Regions        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 1,030 1,023 2,406 2,458
Other revenues 148 161 328 350
Total Operating revenues 1,178 1,184 2,734 2,808
Total Purchased power and fuel expenses (997) (891) (2,359) (2,148)
Total RNF 181 293 375 660
Segment Reconciling Items        
Segment Reporting Information [Line Items]        
Revenues from contracts with customers 426 356 1,263 1,094
Other revenues 526 592 892 1,222
Total Operating revenues 952 948 2,155 2,316
Total Purchased power and fuel expenses (650) (170) (1,917) (1,092)
Total RNF 302 778 238 1,224
Unrealized mark-to-market gains (losses) 304 231 1,015 839
Segment Reconciling Items | Product and Service, Other        
Segment Reporting Information [Line Items]        
Unrealized mark-to-market gains (losses) $ 86 $ 192 $ (201) $ 254