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Dispositions Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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   $ 47    
Impairment of Long-Lived Assets Held-for-use 92   90 $ 92 $ 258
Proceeds from the sale of businesses, net of cash and restricted cash sold       1,808 33
Gain (loss) on disposal and sale of businesses 89   (48) 877 (48)
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       51 66
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 businesses, net of cash and restricted cash sold 307        
Gain (loss) on disposal and sale of businesses (89)        
Tax on gain (loss) on disposition of business   $ 31      
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]          
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax 0   29 9 52
Proceeds from the sale of businesses, net of cash and restricted cash sold   1,050      
Gain (loss) on disposal and sale of businesses   (777)      
Tax on gain (loss) on disposition of business   155      
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kazakhstan [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from the sale of businesses, net of cash and restricted cash sold     24    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     (48)    
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]          
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax 23   12 30 (8)
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 3   6 12 22
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Compania Transmisora del Norte Grande [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets Carrying Amount Disclosure Nonrecurring 95     95  
Proceeds from the sale of businesses, net of cash and restricted cash sold 220        
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   $ (23)      
Kazakhstan [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment of Long-Lived Assets to be Disposed of $ 0   $ 0 $ 0 $ 94