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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