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Basis of Presentation (Details) - USD ($) $ in Millions | Jan. 01, 2018 | Dec. 31, 2017
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Retained Earnings | Accounting Standards Update 2016-16 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ 56 | $ 56

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