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Acquisitions and Dispositions - Dispositions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 03, 2021
USD ($)
Dec. 31, 2021
USD ($)
MW
Sep. 30, 2021
USD ($)
MW
Sep. 30, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Generation capacity (in MW) | MW     23,000  
Gain on sale     $ 17 $ 6
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]        
Percentage of ownership sold 35.00%      
Cash consideration $ 202      
Gain on sale 17      
Cash disposed $ 7      
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Other        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale     $ 3 $ 15
East and West | Forecast | Subsequent Event | Arthur Kill Plant        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Generation capacity (in MW) | MW   866    
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]        
Generation capacity (in MW) | MW   4,850    
Proceeds from sale   $ 760    
Working capital adjustments   $ 11