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Income Taxes - Undistributed earnings (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Undistributed earnings |  |
Undistributed earnings on foreign subsidiaries tax provision | $ 2 | $ 33
Undistributed earnings of foreign subsidiaries | $ 3,000 |

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