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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Measurements, Nonrecurring [Member] |  |
Assets, Fair Value Disclosure | $ 0 | $ 0
Liabilities, Fair Value Disclosure | $ 0 | 0
Samsung Corning Precision Materials Co., Ltd. [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair value of contingent consideration |  | $ 300

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