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Summary of Significant Accounting Policies (Amounts Attributable to Controlling Interests) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Net Income Attributable to Noncontrolling Interest | $ (22) | $ 5 | $ 18
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interests | $ (22) | $ 5 | 7
Income (Loss) from Discontinued Operations Attributable to Noncontrolling Interest, net of tax |  |  | $ 11

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