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Acquisitions and Dispositions (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
May 22, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 28,000,000 |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | (1,683,000,000) |  | $ (95,000,000) |  | $ 28,000,000 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 95,000,000 |  | 169,000,000 |  | 178,000,000 |  |
Income (Loss) from Continuing Operations Attributable to Parent |  | 413,000,000 |  | (43,000,000) |  | (302,000,000) |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate |  | 13,000,000 |  | 3,000,000 |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | 224,000,000 |  |  |  |  |  |
Goodwill |  | 1,177,000,000 |  | $ 1,061,000,000 |  |  |  |
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 |  | 77,000,000 |  | $ 75,000,000 |  | 52,000,000 |  |
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 |  | 56,000,000 |  | $ 55,000,000 |  | 34,000,000 |  |
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] | 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 |  | 501,000,000 |  |  |  |  |  |
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 |  | 21,000,000 |  | $ 20,000,000 |  | 18,000,000 |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 175,000,000 |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  | $ 58,000,000 |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  | 26.00% |  |  |  |
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 |  | 40,000,000 |  | $ 57,000,000 |  | 80,000,000 |  |
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] |  |  |  |  |  |  |  |
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 |  | 0 | [1] | 0 | [1] | 52,000,000 |  |
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 |  | 0 |  | 0 |  | (5,000,000) |  |
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] | 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 |  | 0 |  | 0 |  | (3,000,000) |  |
Disposal Group, Disposed of by 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 |  | 5,000,000 |  | 41,000,000 |  | 30,000,000 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | $ 88,000,000 |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  | 43.00% |  |  |  |  |  |
Disposal Group, Disposed of by 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 |  | $ 0 |  | 5,000,000 |  | 12,000,000 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 6,000,000 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Uruguaiana [Member] |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  | (95,000,000) |  |  |  |
Guaranty Liabilities |  |  |  | 22,000,000 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Alto Maipo |  |  |  |  |  |  |  |
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 |  | 35,000,000 |  | $ 11,000,000 |  | $ (6,000,000) |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | AES Tiete Inova Solucoes |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 20,000,000 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Colon [Domain] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 51,000,000 |  |  |  |  |  |
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% |
Itabo Disposal Group | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  | 4,000,000 |  |  |  |  |  |
AES Tiete Inova Solucoes | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  | (1,000,000) |  |  |  |  |  |
Alto Maipo |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 868,000,000
Alto Maipo | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  | 2,074,000,000 |  |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | 224,000,000 |  |  |  |  |  |
Colon [Domain] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Dispositions and Held-for-Sales Businesses |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  | $ 6,000,000 |  |  |  |  |  |
[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.

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