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Discontinued Operations and Held-For-Sale Businesses (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | $ 1,066 | $ 277 | $ 355
Net loss from disposal and impairments of discontinued operations |  |  |  |  | (3) | (1) | (225)
Other Asset Impairment Charges | $ 849 | $ 69 | $ 116 |  | 864 | 185 | 208
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  | (43) | (302) | (985)
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  | 0 |  |  | 1,251 | 0 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  | $ 3 | $ 1 | $ 218
Borsod [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation Deferred Gain on Disposal |  | 26 |  |  |  |  |
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses) |  | $ 20 |  |  |  |  |
Eletropaulo Subsidiary [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal |  |  |  | 17.00% |  |  |
Proceeds from divestiture of business |  |  | 340 |  |  |  |
Net loss from disposal and impairments of discontinued operations |  |  | (199) |  |  |  |
Impairment Expense Pre Tax Total |  |  | $ 243 |  |  |  |

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