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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]                  
Operating revenues $ 332     $ 296     $ 919 $ 797  
Cost of operations 95     84     275 245  
Depreciation, amortization and accretion 102     114     303 289  
Impairment losses 0     0     0 19  
General and administrative 9     7     30 20  
Transaction and integration costs 1     0     2 2  
Development costs 2     1     4 4  
Operating Income 123     90     305 218  
Equity in earnings of unconsolidated affiliates 19     38     22 52  
Gain on sale of unconsolidated affiliate 0     0     49 0  
Other income, net 0     2     2 6  
Loss on debt extinguishment (6)     0     (9) (1)  
Interest expense (85)     (106)     (345) (337)  
Income (Loss) Before Income Taxes 51     24     24 (62)  
Income tax expense (benefit) 9     (11)     13 (14)  
Net income (loss) 42 $ 76 $ (107) 35 $ (36) $ (47) 11 (48)  
Total Assets 9,725           9,725   $ 9,700
Thermal                  
Segment Reporting Information [Line Items]                  
Impairment losses         $ 19        
Operating Segments                  
Segment Reporting Information [Line Items]                  
Operating revenues 332     296     919 797  
Operating Segments | Conventional Generation                  
Segment Reporting Information [Line Items]                  
Operating revenues 116     90     326 253  
Cost of operations 21     13     67 44  
Depreciation, amortization and accretion 34     26     100 75  
Impairment losses               0  
General and administrative 0     0     0 0  
Transaction and integration costs 0           0 0  
Development costs 0     0     0 0  
Operating Income 61     51     159 134  
Equity in earnings of unconsolidated affiliates 3     3     6 7  
Gain on sale of unconsolidated affiliate             0    
Other income, net 1     0     1 1  
Loss on debt extinguishment 0           0 0  
Interest expense (17)     (13)     (69) (45)  
Income (Loss) Before Income Taxes 48     41     97 97  
Income tax expense (benefit) 0     0     0 0  
Net income (loss) 48     41     97 97  
Total Assets 2,615           2,615    
Operating Segments | Renewables                  
Segment Reporting Information [Line Items]                  
Operating revenues 157     151     444 392  
Cost of operations 33     35     108 102  
Depreciation, amortization and accretion 61     81     182 194  
Impairment losses               0  
General and administrative 0     1     1 1  
Transaction and integration costs 0           0 0  
Development costs 0     0     0 0  
Operating Income 63     34     153 95  
Equity in earnings of unconsolidated affiliates 16     35     16 45  
Gain on sale of unconsolidated affiliate             0    
Other income, net 0     2     1 4  
Loss on debt extinguishment (6)           (6) (1)  
Interest expense (39)     (65)     (190) (213)  
Income (Loss) Before Income Taxes 34     6     (26) (70)  
Income tax expense (benefit) 0     0     0 0  
Net income (loss) 34     6     (26) (70)  
Total Assets 6,210           6,210    
Operating Segments | Thermal                  
Segment Reporting Information [Line Items]                  
Operating revenues 59     55     149 152  
Cost of operations 41     36     100 99  
Depreciation, amortization and accretion 7     7     21 20  
Impairment losses               19  
General and administrative 1     1     4 2  
Transaction and integration costs 0           0 0  
Development costs 2     1     4 4  
Operating Income 8     10     20 8  
Equity in earnings of unconsolidated affiliates 0     0     0 0  
Gain on sale of unconsolidated affiliate             0    
Other income, net (1)     0     0 0  
Loss on debt extinguishment 0           0 0  
Interest expense (6)     (5)     (16) (13)  
Income (Loss) Before Income Taxes 1     5     4 (5)  
Income tax expense (benefit) 0     0     0 0  
Net income (loss) 1     5     4 (5)  
Total Assets 627           627    
Corporate                  
Segment Reporting Information [Line Items]                  
Operating revenues 0     0     0 0  
Cost of operations 0     0     0 0  
Depreciation, amortization and accretion 0     0     0 0  
Impairment losses               0  
General and administrative 8     5     25 17  
Transaction and integration costs 1           2 2  
Development costs 0     0     0 0  
Operating Income (9)     (5)     (27) (19)  
Equity in earnings of unconsolidated affiliates 0     0     0 0  
Gain on sale of unconsolidated affiliate             49    
Other income, net 0     0     0 1  
Loss on debt extinguishment 0           (3) 0  
Interest expense (23)     (23)     (70) (66)  
Income (Loss) Before Income Taxes (32)     (28)     (51) (84)  
Income tax expense (benefit) 9     (11)     13 (14)  
Net income (loss) (41)     $ (17)     (64) $ (70)  
Total Assets $ 273           $ 273