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Acquisitions, Discontinued Operations and Dispositions - Dispositions (Details)
$ in Millions
12 Months Ended
Nov. 01, 2018
USD ($)
MW
Aug. 01, 2018
USD ($)
Jun. 29, 2018
USD ($)
Jun. 28, 2018
USD ($)
Dec. 31, 2018
USD ($)
MW
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Generation capacity (in MW) | MW         23,000  
Parent guarantee         $ 2,767 $ 1,960
Other guarantees            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Parent guarantee         721 $ 645
Agua Caliente Borrower 1, LLC | 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]            
Proceeds from sale of ownership interest $ 120          
Generation capacity (in MW) | MW 290          
BETM | 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]            
Percentage of ownership sold   100.00%        
Proceeds from sale of businesses, net of working capital adjustments   $ 71        
Gain on sale of business   15        
Cash collateral   4        
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Letter of Credit            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Parent guarantee   119        
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Other guarantees            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Parent guarantee   $ 32        
Canal Three | 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]            
Gain on sale of business     $ 17      
Cash received     $ 16      
Cash proceeds       $ 167    
Proceeds distributed to Company       $ 151    
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]            
Cash received         $ 28  
Clearway Energy, Inc. | Agua Caliente Borrower 1, LLC | 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]            
Ownership interest 35.00%