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Acquisitions and Dispositions (Duke 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 (Loss) From Discontinued Operations, net of tax | $ 20 | $ 4 | $ (5) | $ (2) | $ (2) | $ (2) | $ 19 | $ (6) | $ (408)
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)
Other Disposal Groups [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income (Loss) From Discontinued Operations, net of tax |  |  |  |  |  |  |  |  | $ 126

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