v3.26.1
Segments - Segments and Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Abstract]        
Number of reportable segments not disclosed Flag     operating segment  
Segment Reporting [Line Items]        
Operating revenues $ 747 $ 630 $ 1,876 $ 1,020
Operation, maintenance and development expenses 210 192 375 338
Interest expense and other finance charges 214 62 333 136
Capital expenditures 178 37 247 101
Operating Segments | PJM        
Segment Reporting [Line Items]        
Operating revenues 740 638 1,850 1,005
Operation, maintenance and development expenses 202 180 360 318
Interest expense and other finance charges 0 0 0 0
Other segment items 160 343 633 363
Adjusted EBITDA 378 115 857 324
Capital expenditures 52 33 119 95
Operating Segments | Other        
Segment Reporting [Line Items]        
Operating revenues 13 (1) 41 41
Operation, maintenance and development expenses 8 12 15 20
Interest expense and other finance charges 0 0 0 0
Adjusted EBITDA 6 (1) 15 8
Capital expenditures 124 4 126 5
Corporate and Eliminations        
Segment Reporting [Line Items]        
Operating revenues (6) (7) (15) (26)
Interest expense and other finance charges 214 62 333 136
Adjusted EBITDA (10) (24) (25) (42)
Capital expenditures $ 2 $ 0 $ 2 $ 1