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Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 481 | $ 392 | $ 835 | $ 690
Total operating revenues | 481 | 392 | 835 | 690
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 481 | 392 | 835 | 690
Contract amortization | (51) | (45) | (101) | (89)
Mark-to-market for economic hedges | 2 | (13) | 32 | (24)
Total operating revenues | 481 | 392 | 835 | 690
Less: Contract amortization | 51 | 45 | 101 | 89
Less: Mark-to-market for economic hedges | (2) | 13 | (32) | 24
Less: Lease revenue | $ (318) | $ (273) | $ (526) | $ (483)
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 | $ 212 | $ 177 | $ 378 | $ 320
Total | $ 318 | $ 273 | $ 526 | $ 483
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] |  |  |  |
Revenue | $ 86 | $ 50 | $ 147 | $ 118
Contract amortization | (4) | (4) | (9) | (9)
Mark-to-market for economic hedges | 16 | (20) | 9 | (18)
Total operating revenues | 86 | 50 | 147 | 118
Less: Contract amortization | 4 | 4 | 9 | 9
Less: Mark-to-market for economic hedges | (16) | 20 | (9) | 18
Less: Lease revenue | (25) | (29) | (54) | (58)
Total revenue from contracts with customers | 49 | 45 | 93 | 87
Total | 25 | 29 | 54 | 58
Operating Segments | Renewables & Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 395 | 342 | 688 | 572
Contract amortization | (47) | (41) | (92) | (80)
Mark-to-market for economic hedges | (14) | 7 | 23 | (6)
Total operating revenues | 395 | 342 | 688 | 572
Less: Contract amortization | 47 | 41 | 92 | 80
Less: Mark-to-market for economic hedges | 14 | (7) | (23) | 6
Less: Lease revenue | (293) | (244) | (472) | (425)
Total revenue from contracts with customers | 163 | 132 | 285 | 233
Total | 293 | 244 | 472 | 425
Operating Segments | Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 397 | 338 | 658 | 586
Total operating revenues | 397 | 338 | 658 | 586
Less: Lease revenue | (258) | (232) | (414) | (401)
Total | 258 | 232 | 414 | 401
Operating Segments | Energy revenue | Flexible Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8 | 5 | 15 | 11
Total operating revenues | 8 | 5 | 15 | 11
Less: Lease revenue | 0 | 0 | (1) | (1)
Total | 0 | 0 | 1 | 1
Operating Segments | Energy revenue | Renewables & Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 389 | 333 | 643 | 575
Total operating revenues | 389 | 333 | 643 | 575
Less: Lease revenue | (258) | (232) | (413) | (400)
Total | 258 | 232 | 413 | 400
Operating Segments | Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 108 | 90 | 205 | 175
Total operating revenues | 108 | 90 | 205 | 175
Less: Lease revenue | (60) | (41) | (112) | (82)
Total | 60 | 41 | 112 | 82
Operating Segments | Capacity revenue | Flexible Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 66 | 68 | 131 | 132
Total operating revenues | 66 | 68 | 131 | 132
Less: Lease revenue | (25) | (29) | (53) | (57)
Total | 25 | 29 | 53 | 57
Operating Segments | Capacity revenue | Renewables & Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 42 | 22 | 74 | 43
Total operating revenues | 42 | 22 | 74 | 43
Less: Lease revenue | (35) | (12) | (59) | (25)
Total | 35 | 12 | 59 | 25
Operating Segments | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 25 | 22 | 41 | 42
Total operating revenues | 25 | 22 | 41 | 42
Operating Segments | Other revenue | Flexible Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 1 | 1 | 2
Total operating revenues | 0 | 1 | 1 | 2
Operating Segments | Other revenue | Renewables & Storage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 25 | 21 | 40 | 40
Total operating revenues | $ 25 | $ 21 | $ 40 | $ 40

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