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Dispositions Dispositions (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 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 | $ 0 |  | $ 1,180
Gain (loss) on disposal and sale of businesses interests | 4 |  | (788)
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 |  |  | 16
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 |  |  | 9
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 |  |  | 777
Tax on gain (loss) on disposition of business |  |  | 155
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 |  |  | 7
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, Held-for-sale, Not Discontinued Operations [Member] | Jordan [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring | 105 |  |
Proceeds from the sale of business interests, net of cash and restricted cash sold | 86 |  |
Capital Contribution to Project | 5 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Shady Point [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets Carrying Amount Disclosure Nonrecurring | 30 |  |
Proceeds from the sale of business interests, net of cash and restricted cash sold |  | $ 30 |
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 |  |
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
Jordan [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold | 36.00% |  |

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