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Held-for-Sale and Dispositions Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 08, 2021
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain (loss) on disposal and sale of businesses interests   $ 5 $ 0
Equity Method Investment, Ownership Percentage   10.00%  
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
Gain (Loss) on Disposition of Assets     41
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   $ 26 34
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]      
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax   6 11
Assets Carrying Amount Disclosure Nonrecurring   201  
Proceeds from Divestiture of Businesses and Interests in Affiliates   $ 101  
Disposal Group Not Discontinued Operation Ownership Interest Sold   43.00%  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | AES Tiete Inova Solucoes      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Assets Carrying Amount Disclosure Nonrecurring   $ 14  
Proceeds from Divestiture of Businesses and Interests in Affiliates   18  
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
Assets Carrying Amount Disclosure Nonrecurring   $ 503  
Disposal Group Not Discontinued Operation Ownership Interest Sold   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
Assets Carrying Amount Disclosure Nonrecurring   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
Assets Carrying Amount Disclosure Nonrecurring   159  
Proceeds from Divestiture of Businesses and Interests in Affiliates   $ 58  
Disposal Group Not Discontinued Operation Ownership Interest Sold   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%  
Subsequent Event [Member] | 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]      
Proceeds from Divestiture of Businesses and Interests in Affiliates $ 88