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Fair Value Measurements (Unrealized Losses And Fair Value Of Investments With Unrealized Losses) (Details) $ in Millions | Sep. 30, 2018 USD ($) investment
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Number of Investments | investment | 202
Fair Value | $ | $ 247
Corporate and asset-backed debt securities |
Number of Investments | investment | 116
Fair Value | $ | $ 87
Foreign government debt securities |
Number of Investments | investment | 1
Fair Value | $ | $ 2
United States agency debt securities |
Number of Investments | investment | 14
Fair Value | $ | $ 24
United States Treasury debt securities |
Number of Investments | investment | 39
Fair Value | $ | $ 86
Certificates of deposit |
Number of Investments | investment | 32
Fair Value | $ | $ 48

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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