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Divestitures and Discontinued Operations (Revenues and Earnings (Losses) of Businesses Included in Discontinued Operations) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Earnings (loss) from discontinued operations net of tax | $ 0 | $ 1 | $ (7)
Discontinued Operations, Disposed of by Sale [Member] | eCas Business Line [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Earnings (loss) from discontinued operations net of tax | 0 | 0 | (4)
Discontinued Operations, Disposed of by Sale [Member] | Participacoes Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Earnings (loss) from discontinued operations net of tax | $ 0 | $ 1 | $ (3)

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