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v3.22.2

Summary of Significant Accounting Policies - Disaggregated Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | $ 368 | $ 380 | $ 582 | $ 617
Total operating revenues | 368 | 380 | 582 | 617
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 368 | 380 | 582 | 617
Contract amortization | (41) | (37) | (83) | (69)
Mark-to-market for economic hedges | (52) | (31) | (178) | (55)
Total operating revenues | 368 | 380 | 582 | 617
Less: Mark-to-market for economic hedges | 52 | 31 | 178 | 55
Lease income | (377) | (343) | (654) | (597)
Less: Contract amortization | 41 | 37 | 83 | 69
Total revenue from contracts with customers | 84 | 105 | 189 | 144
Operating Segments | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 103 | 109 | 211 | 211
Contract amortization | (6) | (6) | (12) | (12)
Mark-to-market for economic hedges | 0 | 0 | 0 | 0
Total operating revenues | 103 | 109 | 211 | 211
Less: Mark-to-market for economic hedges | 0 | 0 | 0 | 0
Lease income | (109) | (115) | (223) | (223)
Less: Contract amortization | 6 | 6 | 12 | 12
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 247 | 222 | 294 | 308
Contract amortization | (35) | (30) | (71) | (55)
Mark-to-market for economic hedges | (52) | (31) | (178) | (55)
Total operating revenues | 247 | 222 | 294 | 308
Less: Mark-to-market for economic hedges | 52 | 31 | 178 | 55
Lease income | (268) | (228) | (430) | (373)
Less: Contract amortization | 35 | 30 | 71 | 55
Total revenue from contracts with customers | 66 | 55 | 113 | 45
Operating Segments | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 18 | 49 | 77 | 98
Contract amortization | 0 | (1) | 0 | (2)
Mark-to-market for economic hedges | 0 | 0 | 0 | 0
Total operating revenues | 18 | 49 | 77 | 98
Less: Mark-to-market for economic hedges | 0 | 0 | 0 | 0
Lease income | 0 | 0 | (1) | (1)
Less: Contract amortization | 0 | 1 | 0 | 2
Total revenue from contracts with customers | 18 | 50 | 76 | 99
Operating Segments | Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 320 | 292 | 552 | 448
Total operating revenues | 320 | 292 | 552 | 448
Lease income | (271) | (230) | (434) | (377)
Operating Segments | Energy revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 3 | 2 | 3 | 3
Total operating revenues | 3 | 2 | 3 | 3
Lease income | (3) | (2) | (3) | (3)
Operating Segments | Energy revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 306 | 261 | 501 | 387
Total operating revenues | 306 | 261 | 501 | 387
Lease income | (268) | (228) | (430) | (373)
Operating Segments | Energy revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 11 | 29 | 48 | 58
Total operating revenues | 11 | 29 | 48 | 58
Lease income | 0 | 0 | (1) | (1)
Operating Segments | Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 111 | 128 | 239 | 248
Total operating revenues | 111 | 128 | 239 | 248
Lease income | (106) | (113) | (220) | (220)
Operating Segments | Capacity revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 106 | 113 | 220 | 220
Total operating revenues | 106 | 113 | 220 | 220
Lease income | (106) | (113) | (220) | (220)
Operating Segments | Capacity revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 1 | 0 | 1 | 0
Total operating revenues | 1 | 0 | 1 | 0
Lease income | 0 | 0 | 0 | 0
Operating Segments | Capacity revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 4 | 15 | 18 | 28
Total operating revenues | 4 | 15 | 18 | 28
Lease income | 0 | 0 | 0 | 0
Operating Segments | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 30 | 28 | 52 | 45
Total operating revenues | 30 | 28 | 52 | 45
Operating Segments | Other revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 0 | 0 | 0 | 0
Total operating revenues | 0 | 0 | 0 | 0
Operating Segments | Other revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 27 | 22 | 41 | 31
Total operating revenues | 27 | 22 | 41 | 31
Operating Segments | Other revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 3 | 6 | 11 | 14
Total operating revenues | $ 3 | $ 6 | $ 11 | $ 14

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