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Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Operating revenues $ 429 $ 486 $ 1,119 $ 1,115
Total operating revenues 429 486 1,119 1,115
Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 429 486 1,119 1,115
Contract amortization (50) (46) (139) (138)
Mark-to-market for economic hedges (4) 72 (28) 8
Total operating revenues 429 486 1,119 1,115
Less: Contract amortization 50 46 139 138
Less: Mark-to-market for economic hedges 4 (72) 28 (8)
Less: Lease revenue $ (282) $ (274) $ (765) $ (775)
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Total operating revenues Total operating revenues Total operating revenues Total operating revenues
Total revenue from contracts with customers $ 201 $ 186 $ 521 $ 470
Total $ 282 $ 274 $ 765 $ 775
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Total operating revenues Total operating revenues Total operating revenues Total operating revenues
Operating Segments | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues $ 106 $ 102 $ 224 $ 266
Contract amortization (5) (5) (14) (14)
Mark-to-market for economic hedges 26 4 8 12
Total operating revenues 106 102 224 266
Less: Contract amortization 5 5 14 14
Less: Mark-to-market for economic hedges (26) (4) (8) (12)
Less: Lease revenue (29) (27) (87) (84)
Total revenue from contracts with customers 56 76 143 184
Total 29 27 87 84
Operating Segments | Renewables & Storage        
Disaggregation of Revenue [Line Items]        
Operating revenues 323 384 895 849
Contract amortization (45) (41) (125) (124)
Mark-to-market for economic hedges (30) 68 (36) (4)
Total operating revenues 323 384 895 849
Less: Contract amortization 45 41 125 124
Less: Mark-to-market for economic hedges 30 (68) 36 4
Less: Lease revenue (253) (247) (678) (691)
Total revenue from contracts with customers 145 110 378 286
Total 253 247 678 691
Operating Segments | Energy revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 363 350 949 937
Total operating revenues 363 350 949 937
Less: Lease revenue (238) (235) (639) (663)
Total 238 235 639 663
Operating Segments | Energy revenue | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 13 35 24 67
Total operating revenues 13 35 24 67
Less: Lease revenue (1) (1) (2) (2)
Total 1 1 2 2
Operating Segments | Energy revenue | Renewables & Storage        
Disaggregation of Revenue [Line Items]        
Operating revenues 350 315 925 870
Total operating revenues 350 315 925 870
Less: Lease revenue (237) (234) (637) (661)
Total 237 234 637 661
Operating Segments | Capacity revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 94 87 269 239
Total operating revenues 94 87 269 239
Less: Lease revenue (44) (39) (126) (112)
Total 44 39 126 112
Operating Segments | Capacity revenue | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 69 65 201 195
Total operating revenues 69 65 201 195
Less: Lease revenue (28) (26) (85) (82)
Total 28 26 85 82
Operating Segments | Capacity revenue | Renewables & Storage        
Disaggregation of Revenue [Line Items]        
Operating revenues 25 22 68 44
Total operating revenues 25 22 68 44
Less: Lease revenue (16) (13) (41) (30)
Total 16 13 41 30
Operating Segments | Other revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 26 23 68 69
Total operating revenues 26 23 68 69
Operating Segments | Other revenue | Flexible Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 3 3 5 6
Total operating revenues 3 3 5 6
Operating Segments | Other revenue | Renewables & Storage        
Disaggregation of Revenue [Line Items]        
Operating revenues 23 20 63 63
Total operating revenues $ 23 $ 20 $ 63 $ 63