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Summary of Significant Accounting Policies - Disaggregated Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Operating revenues $ 1,371 $ 1,314 $ 1,190
Mark-to-market for economic hedges (35)    
Total operating revenues 1,371 $ 1,314 $ 1,190
Less: Mark-to-market for economic hedges $ 35    
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Total operating revenues Total operating revenues Total operating revenues
Flexible Generation | Energy revenue      
Disaggregation of Revenue [Line Items]      
Less: Lease revenue $ (3) $ (4) $ (6)
Flexible Generation | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Less: Lease revenue (110) (249) (435)
Renewables | Energy revenue      
Disaggregation of Revenue [Line Items]      
Less: Lease revenue (817) (760) (809)
Renewables | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Less: Lease revenue (43) (20) 0
Thermal | Energy revenue      
Disaggregation of Revenue [Line Items]      
Less: Lease revenue     (1)
Thermal | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Less: Lease revenue     0
Operating Segments      
Disaggregation of Revenue [Line Items]      
Operating revenues 1,371 1,314 1,190
Contract amortization (184) (186) (175)
Mark-to-market for economic hedges (35) 19 (182)
Total operating revenues 1,371 1,314 1,190
Less: Contract amortization 184 186 175
Less: Mark-to-market for economic hedges 35 (19) 182
Less: Lease revenue (973) (1,054) (1,251)
Total revenue from contracts with customers 617 427 296
Operating Segments | Energy revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues 1,173 1,023 1,010
Total operating revenues 1,173 1,023 1,010
Operating Segments | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues 327 359 455
Total operating revenues 327 359 455
Operating Segments | Other revenues      
Disaggregation of Revenue [Line Items]      
Operating revenues 90 99 82
Total operating revenues 90 99 82
Operating Segments | Flexible Generation      
Disaggregation of Revenue [Line Items]      
Operating revenues 342 420 417
Contract amortization (18) (20) (24)
Mark-to-market for economic hedges 9 (5) 0
Total operating revenues 342 420 417
Less: Contract amortization 18 20 24
Less: Mark-to-market for economic hedges (9) 5 0
Less: Lease revenue (113) (274) (441)
Total revenue from contracts with customers 238 171 0
Operating Segments | Flexible Generation | Energy revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues 84 81 6
Total operating revenues 84 81 6
Operating Segments | Flexible Generation | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues 262 336 435
Total operating revenues 262 336 435
Operating Segments | Flexible Generation | Other revenues      
Disaggregation of Revenue [Line Items]      
Operating revenues 5 28 0
Total operating revenues 5 28 0
Operating Segments | Renewables      
Disaggregation of Revenue [Line Items]      
Operating revenues 1,029 894 696
Contract amortization (166) (166) (151)
Mark-to-market for economic hedges (44) 24 (182)
Total operating revenues 1,029 894 696
Less: Contract amortization 166 166 151
Less: Mark-to-market for economic hedges 44 (24) 182
Less: Lease revenue (860) (780) (809)
Total revenue from contracts with customers 379 256 220
Operating Segments | Renewables | Energy revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues 1,089 942 956
Total operating revenues 1,089 942 956
Operating Segments | Renewables | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues 65 23 2
Total operating revenues 65 23 2
Operating Segments | Renewables | Other revenues      
Disaggregation of Revenue [Line Items]      
Operating revenues 85 71 71
Total operating revenues $ 85 $ 71 71
Operating Segments | Thermal      
Disaggregation of Revenue [Line Items]      
Operating revenues     77
Contract amortization     0
Mark-to-market for economic hedges     0
Total operating revenues     77
Less: Contract amortization     0
Less: Mark-to-market for economic hedges     0
Less: Lease revenue     (1)
Total revenue from contracts with customers     76
Operating Segments | Thermal | Energy revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues     48
Total operating revenues     48
Operating Segments | Thermal | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Operating revenues     18
Total operating revenues     18
Operating Segments | Thermal | Other revenues      
Disaggregation of Revenue [Line Items]      
Operating revenues     11
Total operating revenues     $ 11