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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]              
Operating revenues $ 368   $ 380   $ 582 $ 617  
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 112   107   240 217  
Depreciation, amortization and accretion 126   128   250 256  
General and administrative 11   10   23 20  
Transaction and integration costs 3   1   5 3  
Development costs 1   1   2 2  
Total operating costs and expenses 253   247   520 498  
Gain on sale of business 1,291   0   1,291 0  
Operating income 1,406   133   1,353 119  
Equity in earnings of unconsolidated affiliates 10   8   14 12  
Loss on debt extinguishment 0   0   (2) (42)  
Other (expense) income, net 5   1   5 2  
Interest expense (47)   (103)   (94) (148)  
Income (Loss) Before Income Taxes 1,374   39   1,276 (57)  
Income tax expense (benefit) 225   7   224 (13)  
Net Income (Loss) 1,149 $ (99) 32 $ (78) 1,052 (44)  
Total Assets 12,648       12,648   $ 12,813
Operating Segments              
Segment Reporting Information [Line Items]              
Operating revenues 368   380   582 617  
Operating Segments | Conventional Generation              
Segment Reporting Information [Line Items]              
Operating revenues 103   109   211 211  
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 28   23   49 50  
Depreciation, amortization and accretion 33   31   66 65  
General and administrative 0   0   0 0  
Transaction and integration costs 0   0   0 0  
Development costs 0   0   0 0  
Total operating costs and expenses 61       115    
Gain on sale of business 0       0    
Operating income 42   55   96 96  
Equity in earnings of unconsolidated affiliates 1   2   2 4  
Loss on debt extinguishment         0 0  
Other (expense) income, net 0   (1)   0 0  
Interest expense (10)   (16)   (18) (27)  
Income (Loss) Before Income Taxes 33   40   80 73  
Income tax expense (benefit) 0   0   0 0  
Net Income (Loss) 33   40   80 73  
Total Assets 2,363       2,363    
Operating Segments | Renewables              
Segment Reporting Information [Line Items]              
Operating revenues 247   222   294 308  
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 73   54   141 106  
Depreciation, amortization and accretion 93   89   184 176  
General and administrative 0   1   0 1  
Transaction and integration costs 0   0   0 0  
Development costs 0   0   0 0  
Total operating costs and expenses 166       325    
Gain on sale of business 0       0    
Operating income 81   78   (31) 25  
Equity in earnings of unconsolidated affiliates 9   6   12 8  
Loss on debt extinguishment         (2) (1)  
Other (expense) income, net 4   1   4 1  
Interest expense (11)   (58)   (19) (62)  
Income (Loss) Before Income Taxes 83   27   (36) (29)  
Income tax expense (benefit) 0   0   0 0  
Net Income (Loss) 83   27   (36) (29)  
Total Assets 9,446       9,446    
Operating Segments | Thermal              
Segment Reporting Information [Line Items]              
Operating revenues 18   49   77 98  
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 11   31   50 62  
Depreciation, amortization and accretion 0   8   0 15  
General and administrative 1   0   2 1  
Transaction and integration costs 0   0   0 0  
Development costs 1   1   2 2  
Total operating costs and expenses 13       54    
Gain on sale of business 0       0    
Operating income 5   9   23 18  
Equity in earnings of unconsolidated affiliates 0   0   0 0  
Loss on debt extinguishment         0 0  
Other (expense) income, net 0   1   0 1  
Interest expense (1)   (4)   (6) (9)  
Income (Loss) Before Income Taxes 4   6   17 10  
Income tax expense (benefit) 0   0   0 0  
Net Income (Loss) 4   6   17 10  
Total Assets 0       0    
Corporate              
Segment Reporting Information [Line Items]              
Operating revenues 0   0   0 0  
Cost of operations, exclusive of depreciation, amortization and accretion shown separately below 0   (1)   0 (1)  
Depreciation, amortization and accretion 0   0   0 0  
General and administrative 10   9   21 18  
Transaction and integration costs 3   1   5 3  
Development costs 0   0   0 0  
Total operating costs and expenses 13       26    
Gain on sale of business 1,291       1,291    
Operating income 1,278   (9)   1,265 (20)  
Equity in earnings of unconsolidated affiliates 0   0   0 0  
Loss on debt extinguishment         0 (41)  
Other (expense) income, net 1   0   1 0  
Interest expense (25)   (25)   (51) (50)  
Income (Loss) Before Income Taxes 1,254   (34)   1,215 (111)  
Income tax expense (benefit) 225   7   224 (13)  
Net Income (Loss) 1,029   $ (41)   991 $ (98)  
Total Assets $ 839       $ 839