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Dispositions Dispositions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment of Long-Lived Assets Held-for-use $ 74   $ 2 $ 166 $ 260
Proceeds from the sale of businesses, net of cash and restricted cash sold, and equity method investments       1,796 39
Gain (loss) on disposal and sale of businesses (21)   (1) 856 (49)
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 8   48 59 114
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, and equity method investments       287  
Disposal group, consideration, contingent liability 9     9  
Gain (loss) on disposal and sale of businesses       69  
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]          
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax 0   26 9 78
Proceeds from the sale of businesses, net of cash and restricted cash sold, and equity method investments       1,050  
Gain (loss) on disposal and sale of businesses       773  
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, and equity method investments         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 8   9 38 1
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 0   11 7 12
Proceeds from the sale of businesses, net of cash and restricted cash sold, and equity method investments       239  
Gain (loss) on disposal and sale of businesses   (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   2 5 23
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 99     99  
Proceeds from the sale of businesses, net of cash and restricted cash sold, and equity method investments 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