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Income Taxes (Net Deferred Tax Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Income Taxes [Abstract] |  |
Deferred tax assets | $ 951 | $ 813
Deferred tax liabilities | (347) | (451)
Net deferred tax assets | $ 604 | $ 362

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