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Held-for-Sale and Dispositions Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 08, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from Divestiture of Businesses and Interests in Affiliates         $ 58 $ 44    
Gain (loss) on disposal and sale of businesses interests   $ (64)   $ 27 $ (59) 27    
Equity Method Investment, Ownership Percentage   10.00%     10.00%      
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Itabo Opco [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from Divestiture of Businesses and Interests in Affiliates $ 88              
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Redondo Beach [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Assets Carrying Amount Disclosure Nonrecurring       24   24    
Gain (Loss) on Disposition of Assets           41    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | AES Tiete Inova Solucoes                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from Divestiture of Businesses and Interests in Affiliates         $ 20      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax   $ 20   23 $ 40 46    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Itabo Opco [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Disposal Group Not Discontinued Operation Ownership Interest Sold   43.00%     43.00%      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Subsidiary [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax   $ 15   15 $ 30 30    
Assets Carrying Amount Disclosure Nonrecurring   $ 502     $ 502      
Disposal Group Not Discontinued Operation Ownership Interest Sold   51.00%     51.00%      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Estrella Del Mar I                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax   $ 0   3 $ 0 6    
Assets Carrying Amount Disclosure Nonrecurring   16     16      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jordan (IPP1 & IPP4)                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax     $ 5 5 10 10    
Assets Carrying Amount Disclosure Nonrecurring   $ 150     150      
Proceeds from Divestiture of Businesses and Interests in Affiliates         $ 58      
Disposal Group Not Discontinued Operation Ownership Interest Sold   26.00%     26.00%      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Financing SPV                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Disposal Group Not Discontinued Operation Ownership Interest Sold   51.00%     51.00%      
Kazakhstan Hydro [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from Divestiture of Businesses and Interests in Affiliates             $ 75  
Proceeds from Legal Settlements         $ 45      
Disposal Group Not Discontinued Operation Ownership Interest Sold               100.00%
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal           (30)    
AES Tiete Inova Solucoes | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal         (1)      
Itabo Opco [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax   $ 1   $ 8 5 $ 19    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal         $ 4