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Acquisitions and Dispositions (International Energy Discontinued Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 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] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  | $ (26) | $ (6) | $ (30)
Income (Loss) From Discontinued Operations, net of tax | $ 20 | $ 4 | $ (5) | $ (2) | $ (2) | $ (2) | 19 | (6) | (408)
Asset Impairment Charges |  |  |  |  |  |  | $ 402 | 282 | 18
International Energy [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income (Loss) From Discontinued Operations, net of tax |  |  |  |  |  |  |  |  | (534)
Asset Impairment Charges |  |  |  |  |  |  |  |  | 194
Cumulative foreign currency translation losses |  |  |  |  |  |  |  |  | 620
Income (Loss) from Discontinued Operation, before Income Tax, Attributable to Parent |  |  |  |  |  |  |  |  | (445)
Income tax expense on disposal |  |  |  |  |  |  |  |  | 126
After-tax loss on disposal |  |  |  |  |  |  |  |  | 640
Previously Remitted Earnings [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  | $ (95) |
Previously Remitted Earnings [Member] | International Energy [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  |  |  |  |  |  |  |  | (95)
Discontinued Operations, Disposed of by Sale [Member] | International Energy [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 988
Fuel used in electric generation and purchased power |  |  |  |  |  |  |  |  | 227
Cost of natural gas |  |  |  |  |  |  |  |  | 43
Operation, maintenance and other |  |  |  |  |  |  |  |  | 341
Depreciation and amortization |  |  |  |  |  |  |  |  | 62
Property and other taxes |  |  |  |  |  |  |  |  | 15
Impairment charges |  |  |  |  |  |  |  |  | 194
(Loss) Gains on Sales of Other Assets and Other, net |  |  |  |  |  |  |  |  | (3)
Other income and expenses, net |  |  |  |  |  |  |  |  | 58
Interest Expense |  |  |  |  |  |  |  |  | 82
Pretax loss on disposal |  |  |  |  |  |  |  |  | 514
(Loss) Income before income taxes |  |  |  |  |  |  |  |  | (435)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | $ 99

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