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Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Allowance for Doubtful Accounts |  |  |  |  |  |  |  |  | $ 94,000,000 |  |  |  |  |  |  | $ 94,000,000 |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 164,000,000 |  | 529,000,000 | $ (125,000,000)
Disposal Group, Including Discontinued Operation, Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,320,000,000 |  | 4,036,000,000 | 4,430,000,000
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 |  | (229,000,000) | 53,000,000
Income (loss) from operations of discontinued businesses, after income tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,000,000) |  | 151,000,000 | 80,000,000
Net loss from disposal and impairments of discontinued businesses, after income tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (611,000,000) |  | (1,119,000,000) | 0
Disposal Group, Including Discontinued Operation, Assets | [1] |  |  | $ 2,034,000,000 |  |  |  |  | 4,936,000,000 |  |  |  |  | 2,034,000,000 |  | 4,936,000,000 |
Disposal Group, Including Discontinued Operation, Liabilities | [1] |  |  | 1,033,000,000 |  |  |  |  | 4,249,000,000 |  |  |  |  | 1,033,000,000 |  | 4,249,000,000 |
Disposal Group, Including Discontinued Operation, Costs of Goods Sold |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,151,000,000) |  | (3,954,000,000) | (4,227,000,000)
Impairment Expense Pre Tax Total |  |  |  | (277,000,000) |  | $ (2,000,000) | $ (90,000,000) | $ (168,000,000) | (623,000,000) | $ (79,000,000) | $ (235,000,000) | $ (159,000,000) |  |  |  |  |
Disposal Group, Including Discontinued Operation, Other Expense |  |  |  |  |  |  |  |  |  |  |  |  |  | (166,000,000) |  | (160,000,000) | (70,000,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (608,000,000) |  | (1,463,000,000) | 133,000,000
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 |  | (495,000,000) | 53,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | (654,000,000) |  | (1,110,000,000) | (12,000,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  | (288,000,000) |  | (368,000,000) | (65,000,000)
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 537,000,000 |  | 1,098,000,000 | 602,000,000
Other Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 537,000,000 |  | 1,096,000,000 | 285,000,000
Eletropaulo Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  |  |  | 0 |  |  |  |  | 61,000,000 |  |  |  |  | 0 |  | 61,000,000 |
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets |  |  |  | 0 |  |  |  |  | 268,000,000 |  |  |  |  | 0 |  | 268,000,000 |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  |  | 0 |  |  |  |  | 745,000,000 |  |  |  |  | 0 |  | 745,000,000 |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  |  |  | 0 |  |  |  |  | 2,504,000,000 |  |  |  |  | 0 |  | 2,504,000,000 |
Disposal Group, Including Discontinued Operations, Investments in and Advances to Affiliates |  |  |  | 86,000,000 | [2] |  |  |  | 0 |  |  |  |  | 86,000,000 | [2] | 0 |
Disposal Group, Including Discontinued Operation, Deferred Tax Assets |  |  |  | 0 |  |  |  |  | 554,000,000 |  |  |  |  | 0 |  | 554,000,000 |
Disposal Group, Including Discontinued Operation, Other Assets |  |  |  | 0 |  |  |  |  | 305,000,000 |  |  |  |  | 0 |  | 305,000,000 |
Disposal Group, Including Discontinued Operation, Accounts Payable |  |  |  | 0 |  |  |  |  | 418,000,000 |  |  |  |  | 0 |  | 418,000,000 |
Disposal Group, Including Discontinued Operation, Accrued Liabilities |  |  |  | 0 |  |  |  |  | 954,000,000 |  |  |  |  | 0 |  | 954,000,000 |
Non Recourse Debt Held For Sale Or Discontinued Operations |  |  |  | 0 |  |  |  |  | 1,009,000,000 |  |  |  |  | 0 |  | 1,009,000,000 |
Disposal Group, Including Discontinued Operation, Other Liabilities |  |  |  | 0 |  |  |  |  | 31,000,000 |  |  |  |  | 0 |  | 31,000,000 |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (633,000,000) |  | (192,000,000) | 73,000,000
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 |  | $ (737,000,000) | $ (382,000,000) |  |  |  |  |  |  |  |  |  |  |  |  | (1,119,000,000) |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,413,000,000) | $ (32,000,000)
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 |  |  |  | 86,000,000 |  |  |  |  | 4,936,000,000 |  |  |  |  | 86,000,000 |  | 4,936,000,000 |
Disposal Group, Including Discontinued Operation, Liabilities |  |  |  | 0 |  |  |  |  | 4,249,000,000 |  |  |  |  | 0 |  | 4,249,000,000 |
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 |  |  |  | 1,948,000,000 | [3] |  |  |  | 0 |  |  |  |  | 1,948,000,000 | [3] | 0 |
Disposal Group, Including Discontinued Operation, Liabilities |  |  |  | $ 1,033,000,000 | [3] |  |  |  | $ 0 |  |  |  |  | $ 1,033,000,000 | [3] | $ 0 |
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 | [4] |  |  |  |  |  |  |  |  |  |  |  | $ 783,000,000 |  |  |  |
[1] | Amounts at December 31, 2016 are classified as both current and long-term on the Consolidated Balance Sheet.
[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 22—Held-for-Sale Businesses and Dispositions for further information.
[4] | See Note 19—Asset Impairment Expense for further information.

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