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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%

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