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Acquisitions and Dispositions - Held For Sale (Details)
$ in Millions
Dec. 31, 2021
MW
Sep. 30, 2021
USD ($)
MW
Feb. 03, 2021
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Power Generation Capacity, Megawatts | MW   23,000  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Agua Caliente Solar Project      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash consideration     $ 202
East and West | Arthur Kill Plant | Forecast | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Power Generation Capacity, Megawatts | MW 866    
East and West | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Current assets - discontinued operations   $ 51  
Property, plant and equipment, net   391  
Other non-current assets   3  
Noncurrent assets   394  
Total assets held for sale   445  
Current liabilities   14  
Non-current liabilities   61  
Total liabilities held for sale   $ 75  
East and West | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Forecast | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Power Generation Capacity, Megawatts | MW 4,850    
East      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Power Generation Capacity, Megawatts | MW   1,600  
East | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant and equipment, net   $ 242  
West/Services/Other | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant and equipment, net   $ 149