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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Charge for U.S. tax reform | $ 275 |
Charge for U.S. tax reform |  | $ 80

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