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Held-for-Sale and Dispositions Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2017
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from the sale of business interests, net of cash and restricted cash sold     $ 44 $ 229    
Gain (loss) on disposal and sale of businesses interests $ 27 $ 3 27 7    
Gain (Loss) on Disposition of Assets     40 (16)    
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 Noncontrolling Interest, before Income Tax   (7)   (4)    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Shady Point [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 Noncontrolling Interest, before Income Tax   (2)   (3)    
Proceeds from the sale of business interests, net of cash and restricted cash sold       29    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from the sale of business interests, net of cash and restricted cash sold         $ 75  
Proceeds from Legal Settlements     45      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     (30)      
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, Disposed of by Sale, Not Discontinued Operations [Member] | Kilroot and Ballylumford [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 Noncontrolling Interest, before Income Tax   (5)   (1)    
Proceeds from the sale of business interests, net of cash and restricted cash sold       118    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal       (33)    
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 13 11 29 22    
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 8 6 19 14    
Assets Carrying Amount Disclosure Nonrecurring $ 194   194      
Proceeds from the sale of business interests, net of cash and restricted cash sold     $ 101      
Disposal Group Not Discontinued Operation Ownership Interest Sold 43.00%   43.00%      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | JORDAN            
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 8    
Assets Carrying Amount Disclosure Nonrecurring $ 153   $ 153      
Disposal Group Not Discontinued Operation Ownership Interest Sold 36.00%   36.00%      
Kilroot and Ballylumford [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets Carrying Amount Disclosure Nonrecurring   $ 114   $ 114    
Kilroot and Ballylumford [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]            
Disposal Group Not Discontinued Operation Ownership Interest Sold   100.00%   100.00%    
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]            
Disposal Group Not Discontinued Operation Ownership Interest Sold         100.00%