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Acquisitions and Dispositions (Details) - USD ($) $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 07, 2017 | Feb. 18, 2016 | Jan. 27, 2016 | Jan. 01, 2016 | Jun. 25, 2014 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 20, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  | $ 128 | $ (21) | $ 89 | $ 788 |  | $ (48) |  |  | $ 984 |  | $ (52) | $ 29 |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,020 |  | 108 | 538 |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | (985) |  | 507 | 20 |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Ownership Interests |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 94 | 0 |
Asset Retirement Obligation, Revision of Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 |  | 25 |  |
Jordan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest sold |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  | $ 436 |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  | 30 |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  | 24 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 107 |  | 218 | 166 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | DPL 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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 77 | [1],[2] | 17 | 0 |
Disposal Group, Disposed of by 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  |  |  | 129 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 225 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Cash Paid to Settle |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  | (12) |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  |  |  | 69 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 287 |  |  |  |
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 |  | 17 | 20 |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 239 |  |  |  |
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 |  | 103 | 103 |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  |  |  | 772 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,050 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Zimmer and Miami Fort [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 | (14) |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | $ 13 |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  | $ 70 |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [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 |  | 33 | 34 |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | UK Wind Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  | $ (20) |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kelanitissa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | $ (5) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | $ 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 13 | 12 |
Gain (Loss) on Disposition of Business | $ (49) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | DPLER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | $ 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | $ 76 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  | $ 9 | 11 |
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 Disposition of Business |  |  |  |  |  |  |  |  | $ 23 |  |  |  |  |  |  |  |  |
IPP4 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  | 36.00% |  |  |  |  |  | 36.00% |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest sold |  |  |  |  | 45.00% |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  | 51.00%
Divestiture of Businesses, Portion Contingent Upon Achievement of Certain Restructuring Efficiencies |  |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |
Kazakhstan Hydro [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 |  | $ 92 | $ 0 |
Kazakhstan Hydro [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  |  | $ (33) |  |  |  |  |
DPL Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  | (32) |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | DPL Peaking Generation [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  |  |  |  |  |  |  | 109 |  |  |  |
Fair Value Less Costs To Sell |  |  |  |  |  | 237 |  |  |  |  |  |  |  | 237 |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  | $ 346 |  |  |  |  |  |  |  | 346 |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kazakhstan Hydro [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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |  |  |
Fair Value Less Costs To Sell |  |  |  |  |  |  |  |  |  |  | 92 |  | 92 |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  |  |  |  |  |  | $ 190 |  | $ 190 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | DPL Subsidiary [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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 66 |  |  |  |
[1] | Reductions in the asset retirement obligations for ash ponds and landfills at Stuart and Killen in 2018 resulted in a $32 million reduction to cost of sales. See Note 3—Property, Plant and Equipment for further information.
[2] | The Company entered into contracts to buy back all open capacity years for Stuart and Killen at prices lower than the PJM capacity revenue prices. As such, the Company continues to earn capacity margin.

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