v3.26.1
Segments - Segments and Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting [Abstract]    
Number of reportable segments not disclosed Flag operating segment  
Segment Reporting Information [Line Items]    
Operating revenues $ 1,129 $ 390
Operation, maintenance and development expenses 165 146
Interest expense and other finance charges 119 74
Capital expenditures 69 64
Operating Segments | PJM    
Segment Reporting Information [Line Items]    
Operating revenues 1,110 367
Operation, maintenance and development expenses 158 138
Interest expense and other finance charges 0 0
Other segment items 473 20
Adjusted EBITDA 479 209
Capital expenditures 67 62
Operating Segments | Other    
Segment Reporting Information [Line Items]    
Operating revenues 28 42
Operation, maintenance and development expenses 7 8
Interest expense and other finance charges 0 0
Adjusted EBITDA 9 9
Capital expenditures 2 1
Corporate and Eliminations    
Segment Reporting Information [Line Items]    
Operating revenues (9) (19)
Interest expense and other finance charges 119 74
Adjusted EBITDA (15) (18)
Capital expenditures $ 0 $ 1