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Leases - Revenue Related to Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]        
Renewal period 5 years      
Lease receivable $ 21      
Net investment costs 13      
Net income $ 8 $ (63) $ (14) $ 1,060
Energy revenue | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Lease revenue   3 4 6
Energy revenue | Renewables        
Disaggregation of Revenue [Line Items]        
Lease revenue   817 760 809
Energy revenue | Thermal        
Disaggregation of Revenue [Line Items]        
Lease revenue       1
Energy revenue | Total Segments        
Disaggregation of Revenue [Line Items]        
Lease revenue   820 764 816
Capacity revenue | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Lease revenue   110 249 435
Capacity revenue | Renewables        
Disaggregation of Revenue [Line Items]        
Lease revenue   43 20 0
Capacity revenue | Thermal        
Disaggregation of Revenue [Line Items]        
Lease revenue       0
Capacity revenue | Total Segments        
Disaggregation of Revenue [Line Items]        
Lease revenue   153 269 435
Operating revenues | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Lease revenue   113 274 441
Operating revenues | Renewables        
Disaggregation of Revenue [Line Items]        
Lease revenue   860 780 809
Operating revenues | Thermal        
Disaggregation of Revenue [Line Items]        
Lease revenue       1
Operating revenues | Total Segments        
Disaggregation of Revenue [Line Items]        
Lease revenue   $ 973 1,054 $ 1,251
Other revenue | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Lease revenue     21  
Other revenue | Renewables        
Disaggregation of Revenue [Line Items]        
Lease revenue     0  
Other revenue | Total Segments        
Disaggregation of Revenue [Line Items]        
Lease revenue     $ 21