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Income Taxes (Source of Income (Loss) Before Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Income from continuing operations before income taxes | $ 949 | $ 1,590 | $ 1,568
Income from discontinued operations before income taxes | 0 | 1 | 15
Income before income tax | $ 949 | $ 1,591 | $ 1,583

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- Definition The portion of earnings or loss from continuing and discontinuing operations before income taxes less the amount attributable to noncontrolling interest. + References No definition available. + Details
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- Definition Sum of operating profit and nonoperating income or expense before income taxes less the amount attributable to noncontrolling interest. + References No definition available. + Details
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- Definition The portion of earnings or loss from discontinuing operations before income taxes less the amount attributable to noncontrolling interest. + References No definition available. + Details
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- References No definition available. + Details
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