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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 20, 2018
Income Tax Disclosures [Line Items]              
One-time Transition Tax Rate $ (57)   $ (132)   $ (172) $ (363)  
Gain (Loss) on Disposition of Business $ 3   $ (89)   $ 7 $ (877)  
Effective Income Tax Rate Reconciliation, Percent 48.00%   39.00%   36.00% 27.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         21.00%    
Proceeds from Divestiture of Businesses and Interests in Affiliates         $ 229 $ 1,808  
Electrica Santiago (Gener ESSA) [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]              
Income Tax Disclosures [Line Items]              
Gain (Loss) on Disposition of Business     $ 89        
Tax on gain (loss) on disposition of business     31        
Proceeds from Divestiture of Businesses and Interests in Affiliates     $ 307        
Masinloc Subsidiary [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]              
Income Tax Disclosures [Line Items]              
Gain (Loss) on Disposition of Business       $ 777      
Tax on gain (loss) on disposition of business       155      
Proceeds from Divestiture of Businesses and Interests in Affiliates       $ 1,050      
Masinloc Subsidiary [Member]              
Income Tax Disclosures [Line Items]              
Disposal Group Not Discontinued Operation Ownership Interest Sold             51.00%
Change in Accounting Estimate, Type [Domain] | UNITED STATES              
Income Tax Disclosures [Line Items]              
One-time Transition Tax Rate   $ (3)