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Summary of Significant Accounting Policies - Disaggregated Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 332 | $ 296 | $ 919 | $ 797
Lease income |  | (252) | (794) | (675)
Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (91) | (344) | (257)
Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (160) | (449) | (416)
Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (1) | (1) | (2)
Energy Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (163) | (456) | (422)
Energy Revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (2) |  | (4)
Energy Revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (160) |  | (416)
Energy Revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (1) |  | (2)
Capacity Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (89) | (338) | (253)
Capacity Revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | (89) |  | (253)
Capacity Revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | 0 |  | 0
Capacity Revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Lease income |  | 0 |  | 0
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 332 | 296 | 919 | 797
Contract amortization | 22 | 18 | 66 | 52
Mark-to-market for economic hedges |  | (2) | (8) | (9)
Lease income | (275) | (252) | (794) | (675)
Total revenue from contracts with customers | 79 | 64 | 199 | 183
Operating Segments | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 116 | 90 | 326 | 253
Contract amortization | 6 | 1 | 18 | 4
Mark-to-market for economic hedges |  | 0 | 0 | 0
Lease income | (122) | (91) | (344) | (257)
Total revenue from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 157 | 151 | 444 | 392
Contract amortization | 15 | 16 | 46 | 46
Mark-to-market for economic hedges |  | (2) | (8) | (9)
Lease income | (153) | (160) | (449) | (416)
Total revenue from contracts with customers | 19 | 9 | 49 | 31
Operating Segments | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 59 | 55 | 149 | 152
Contract amortization | 1 | 1 | 2 | 2
Mark-to-market for economic hedges |  | 0 | 0 | 0
Lease income | 0 | (1) | (1) | (2)
Total revenue from contracts with customers | 60 | 55 | 150 | 152
Operating Segments | Energy Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 196 | 202 | 569 | 536
Lease income | (156) | (163) | (456) | (422)
Operating Segments | Energy Revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 3 | 2 | 6 | 4
Lease income | (3) | (2) | (6) | (4)
Operating Segments | Energy Revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 166 | 167 | 486 | 441
Lease income | (153) | (160) | (449) | (416)
Operating Segments | Energy Revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 27 | 33 | 77 | 91
Lease income | 0 | (1) | (1) | (2)
Operating Segments | Capacity Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 143 | 103 | 388 | 294
Lease income | (119) | (89) | (338) | (253)
Operating Segments | Capacity Revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 119 | 89 | 338 | 253
Lease income | (119) | (89) | (338) | (253)
Operating Segments | Capacity Revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0
Lease income | 0 | 0 | 0 | 0
Operating Segments | Capacity Revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 24 | 14 | 50 | 41
Lease income | 0 | 0 | 0 | 0
Operating Segments | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 15 | 11 | 36 | 28
Operating Segments | Other revenue | Conventional Generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 0 | 0 | 0 | 0
Operating Segments | Other revenue | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 6 | 2 | 12 | 6
Operating Segments | Other revenue | Thermal |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 9 | $ 9 | $ 24 | $ 22

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