v3.26.1
Segments - Schedule of Adjusted EBITDA and Reconciling Items (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reconciling Items:    
Interest expense and other finance charges $ (119) $ (74)
Depreciation, amortization and accretion (63) (70)
Nuclear fuel amortization (24) (26)
Unrealized gain (loss) on commodity derivative contracts (154) (182)
Nuclear decommissioning trust funds gain (loss), net (22) (12)
Stock-based and other long-term incentive compensation expense (2) (13)
Acquisition and divestiture activities (1) (7)
Operational and other restructuring activities (9) (2)
Other items 2 (1)
Income (loss) before income taxes 81 (187)
Operating Segments | PJM    
Segment Adjusted EBITDA:    
Adjusted EBITDA 479 209
Reconciling Items:    
Interest expense and other finance charges 0 0
Operating Segments | Other    
Segment Adjusted EBITDA:    
Adjusted EBITDA 9 9
Reconciling Items:    
Interest expense and other finance charges 0 0
Corporate and Eliminations    
Segment Adjusted EBITDA:    
Adjusted EBITDA (15) (18)
Reconciling Items:    
Interest expense and other finance charges $ (119) $ (74)