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Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income tax expense |  |  |  | $ 0 | $ 0 | $ 2
Income (loss) from operations of discontinued businesses, after income tax |  |  |  | 0 | 0 | (9)
Net loss from disposal and impairments of discontinued businesses, after income tax |  |  |  | 3 | 1 | 225
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  | 3 | 1 | 218
Asset Impairment Charges |  |  |  | 1,066 | 277 | 355
Other Asset Impairment Charges | $ 849 | $ 69 | $ 116 | $ 864 | $ 185 | $ 208
Eletropaulo Subsidiary [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net loss from disposal and impairments of discontinued businesses, after income tax |  |  | $ 199 |  |  |

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