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Acquisitions and Dispositions (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 22, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 20, 2018 | Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  | $ (95,000,000) | $ 28,000,000 |  | $ 984,000,000 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  | 169,000,000 | 178,000,000 |  | 2,020,000,000 |  |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  | (43,000,000) | (302,000,000) |  | (985,000,000) |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate |  |  |  |  |  | $ 3,000,000 | 58,000,000 |  |  |  |
JORDAN |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 10.00% |  |  |  |  |
Disposal Group, Held-for-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 |  |  |  |  |  | $ 121,000,000 | 94,000,000 |  | 109,000,000 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 51.00% |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong Finance Holdings B.V._Related Party [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 |  |  |  |  |  | $ 55,000,000 | 34,000,000 |  | 48,000,000 |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 51.00% |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Itabo Disposal Group |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 41,000,000 | 30,000,000 |  | 33,000,000 |  |
Proceeds from Divestiture of Businesses |  |  |  |  | $ 101,000,000 | $ 92,000,000 |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 43.00% |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Estrella del Mar I |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 5,000,000 | 12,000,000 |  | 17,000,000 |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  | 16,000,000 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Itabo Opco [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  | 189,000,000 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Mong Duong held-dfor-sale [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  | 472,000,000 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | JORDAN |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 20,000,000 | $ 18,000,000 |  | 11,000,000 |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  |  | 154,000,000 |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  | $ 58,000,000 |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 26.00% | 36.00% |  |  |  |
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 |  |  |  |  |  |  | $ 44,000,000 |  | 154,000,000 |  |
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 |  |  |  |  |  |  | (1,000,000) |  | 35,000,000 |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  | 33,000,000 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  | 118,000,000 |  |  |  |
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 |  |  |  |  |  |  | 52,000,000 | [1],[2] | 77,000,000 |  |
Asset Retirement Obligation, Cash Paid to Settle |  |  |  |  |  | $ 51,000,000 |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  | 20,000,000 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax |  |  |  |  |  |  | (5,000,000) |  | 19,000,000 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 29,000,000 |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by 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 |  |  |  |  |  | 24,000,000 |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  | 41,000,000 |  |  |  |  |
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 |  |  |  |  |  |  | 126,000,000 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  | 225,000,000 |  |  |  |
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 |  | $ 15,000,000 |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  | (12,000,000) |  |  |  |  |  |  |  |  |
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 |  |  | $ 70,000,000 |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | $ 287,000,000 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | (2,000,000) |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 239,000,000 |  |  |  |  |  |  |  |  |
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 |  | 9,000,000 |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  | 772,000,000 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | $ 1,050,000,000.00 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  |  |  |  |  |  | 75,000,000 |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  | (30,000,000) |  |  |  |  |
Proceeds from Legal Settlements |  |  |  |  |  | 45,000,000 |  |  |  |  |
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 |  |  |  |  |  |  | (2,000,000) |  | 14,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Uruguaiana [Member] |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  | (90,000,000) |  |  |  |  |
Guaranty Liabilities |  |  |  |  |  | $ 22,000,000 |  |  |  |  |
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 |  | $ 23,000,000 |  |  |  |  |  |  |  |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  |  |  |  |  | 51.00% |
Kazakhstan Hydro [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  |  |  |  |  |  | 100.00%
DPL Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate |  |  |  |  |  |  | $ 87,000,000 |  | $ 32,000,000 |  |
[1] | After the retirement of Stuart and Killen in 2018, the Company entered into contracts to buy back all open capacity years for the plants at prices lower than the PJM capacity revenue prices. As such, the Company continued to earn capacity margin until the plants were transferred in December 2019.
[2] | 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 4—Asset Retirement Obligations for further information.

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