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Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  |  |  |  |  |  |  |  |  |  | $ 164 |  | $ 529
Disposal Group, Including Discontinued Operation, Revenue |  |  |  |  |  |  |  |  |  |  | 3,320 |  | 4,036
Income tax expense |  |  |  |  |  |  |  |  |  | $ 2 | 21 |  | (229)
Income (loss) from operations of discontinued businesses, after income tax |  |  |  |  |  |  |  |  |  | (9) | (18) |  | 151
Net loss from disposal and impairments of discontinued businesses, after income tax |  |  |  |  |  |  |  |  |  | 225 | (611) |  | (1,119)
Disposal Group, Including Discontinued Operation, Assets |  |  |  |  |  |  | $ 2,034 |  |  |  | 2,034 |  |
Disposal Group, Including Discontinued Operation, Liabilities |  |  |  |  |  |  | 1,033 |  |  |  | 1,033 |  |
Disposal Group, Including Discontinued Operation, Costs of Goods Sold |  |  |  |  |  |  |  |  |  |  | (3,151) |  | (3,954)
Disposal Group, Including Discontinued Operation, Other Expense |  |  |  |  |  |  |  |  |  |  | (166) | [1] | (160)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  | (608) |  | (1,463)
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  |  |  |  |  |  |  | (21) |  | 495
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  | 218 | (654) |  | (1,110)
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  |  |  |  |  |  |  |  |  | (288) |  | (368)
Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 355 | 537 |  | 1,098
Other Asset Impairment Charges |  |  |  | $ 42 | $ 74 | $ 92 | 277 | $ 90 | $ 168 | $ 208 | 537 |  | 1,096
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 |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operations, Investments in and Advances to Affiliates | [2] |  |  |  |  |  | 86 |  |  |  | 86 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  | (633) |  | (192)
Sul 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 |  | $ 737 | $ 382 |  |  |  |  |  |  |  |  |  | 1,100
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,400)
Discontinued Operations [Member] | Eletropaulo Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets |  |  |  |  |  |  | 86 |  |  |  | 86 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets | [3] |  |  |  |  |  | 1,948 |  |  |  | 1,948 |  |
Disposal Group, Including Discontinued Operation, Liabilities | [3] |  |  |  |  |  | $ 1,033 |  |  |  | $ 1,033 |  |
Discontinued Operations, Held-for-sale [Member] | Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  |  | $ 783 |  |  |  |  |  |  |  |  |  |
[1] | Includes a loss contingency recognized by our equity method investment in discontinued operations.
[2] | Represents the Company's 17% ownership interest in Eletropaulo
[3] | Masinloc, Eletrica Santiago, and the DPL peaker assets were classified as held-for-sale as of December 31, 2017. See Note 23—Held-for-Sale and Dispositions for further information.

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