v3.25.2
Revenue - Schedule of Components of Operating Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 409 $ 346 $ 1,063 $ 762
Realized and unrealized gain (loss) on derivative instruments 218 100 (50) 157
Nuclear PTC 0 39 0 74
Other revenue 3 4 7 5
Operating revenues 630 489 1,020 998
Capacity revenues        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 88 46 137 91
Operating revenues 88 46 137 91
Electricity sales and ancillary services, ISO/RTO        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 307 249 889 514
Physical electricity sales, bilateral contracts, other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 14 22 37 86
Other revenue from customers        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 0 $ 29 $ 0 $ 71