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Held-for-Sale and Dispositions Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 13, 2019
May 22, 2019
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 20, 2018
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             $ 226 $ 1,796  
Gain (loss) on disposal and sale of businesses interests     $ (16) $ 21     (9) (856)  
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) 15     25 90  
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 Parent, before Income Tax     0 0     (1) 19  
Proceeds from the sale of business interests, net of cash and restricted cash sold $ 118                
Gain (loss) on disposal and sale of businesses interests $ (33)                
Disposal Group Not Discontinued Operation Ownership Interest Sold 100.00%                
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]                  
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] | Electrica Santiago (Gener ESSA) [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         $ 287        
Gain (loss) on disposal and sale of businesses interests         $ 70        
Tax on gain (loss) on disposition of business       25          
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Masinloc Subsidiary [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           $ 1,050      
Gain (loss) on disposal and sale of businesses interests           773      
Tax on gain (loss) on disposition of business           155      
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | DPL Subsidiary [Domain]                  
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     30 38  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | DPL Peaking Generation [Domain]                  
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           239      
Gain (loss) on disposal and sale of businesses interests           (2)      
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Beckjord Facility [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           (12)      
Asset Retirement Obligation, Cash Paid to Settle           (15)      
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Subsidiaries [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     0 $ 7     (4) 33  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jordan [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 $ 8  
Assets Carrying Amount Disclosure Nonrecurring     $ 131       131    
Proceeds from the sale of business interests, net of cash and restricted cash sold             86    
Capital Contribution to Project             $ 5    
Disposal Group Not Discontinued Operation Ownership Interest Sold     36.00%       36.00%    
Disposal Group, Held-for-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    
Disposal Group, Not Discontinued Operations [Member] | Advancion Energy Storage [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Gain (loss) on disposal and sale of businesses interests           $ 23      
Masinloc Subsidiary [Member]                  
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%