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v3.25.3

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

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