v3.24.3
Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Operating revenues $ 486 $ 371 $ 1,115 $ 1,065
Total operating revenues $ 486 $ 371 $ 1,115 $ 1,065
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        
Disaggregation of Revenue [Line Items]        
Operating revenues $ 486 $ 371 $ 1,115 $ 1,065
Contract amortization (46) (47) (138) (141)
Mark-to-market for economic hedges 72 (18) 8 27
Total operating revenues 486 371 1,115 1,065
Less: Contract amortization 46 47 138 141
Less: Mark-to-market for economic hedges (72) 18 (8) (27)
Less: Lease revenue (274) (274) (775) (872)
Total revenue from contracts with customers 186 162 470 307
Total 274 274 775 872
Operating Segments | Conventional Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 102 132 266 342
Contract amortization (5) (5) (14) (16)
Mark-to-market for economic hedges 4 3 12 3
Total operating revenues 102 132 266 342
Less: Contract amortization 5 5 14 16
Less: Mark-to-market for economic hedges (4) (3) (12) (3)
Less: Lease revenue (27) (41) (84) (246)
Total revenue from contracts with customers 76 93 184 109
Total 27 41 84 246
Operating Segments | Renewables        
Disaggregation of Revenue [Line Items]        
Operating revenues 384 239 849 723
Contract amortization (41) (42) (124) (125)
Mark-to-market for economic hedges 68 (21) (4) 24
Total operating revenues 384 239 849 723
Less: Contract amortization 41 42 124 125
Less: Mark-to-market for economic hedges (68) 21 4 (24)
Less: Lease revenue (247) (233) (691) (626)
Total revenue from contracts with customers 110 69 286 198
Total 247 233 691 626
Operating Segments | Energy revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 350 337 937 814
Total operating revenues 350 337 937 814
Less: Lease revenue (235) (230) (663) (617)
Total 235 230 663 617
Operating Segments | Energy revenue | Conventional Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 35 57 67 61
Total operating revenues 35 57 67 61
Less: Lease revenue (1) (2) (2) (4)
Total 1 2 2 4
Operating Segments | Energy revenue | Renewables        
Disaggregation of Revenue [Line Items]        
Operating revenues 315 280 870 753
Total operating revenues 315 280 870 753
Less: Lease revenue (234) (228) (661) (613)
Total 234 228 661 613
Operating Segments | Capacity revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 87 79 239 285
Total operating revenues 87 79 239 285
Less: Lease revenue (39) (44) (112) (234)
Total 39 44 112 234
Operating Segments | Capacity revenue | Conventional Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 65 74 195 270
Total operating revenues 65 74 195 270
Less: Lease revenue (26) (39) (82) (221)
Total 26 39 82 221
Operating Segments | Capacity revenue | Renewables        
Disaggregation of Revenue [Line Items]        
Operating revenues 22 5 44 15
Total operating revenues 22 5 44 15
Less: Lease revenue (13) (5) (30) (13)
Total 13 5 30 13
Operating Segments | Other revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 23 20 69 80
Total operating revenues 23 20 69 80
Less: Lease revenue       (21)
Total       21
Operating Segments | Other revenue | Conventional Generation        
Disaggregation of Revenue [Line Items]        
Operating revenues 3 3 6 24
Total operating revenues 3 3 6 24
Less: Lease revenue       (21)
Total       21
Operating Segments | Other revenue | Renewables        
Disaggregation of Revenue [Line Items]        
Operating revenues 20 17 63 56
Total operating revenues $ 20 $ 17 $ 63 56
Less: Lease revenue       0
Total       $ 0