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Fair Value Measurements (Unrealized Losses And Fair Value Of Investments With Unrealized Losses) (Details) $ in Millions | Mar. 31, 2018 USD ($) investment
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Number of Investments | investment | 211
Fair Value | $ | $ 258
Corporate and asset-backed debt securities |
Number of Investments | investment | 124
Fair Value | $ | $ 100
Foreign government debt securities |
Number of Investments | investment | 1
Fair Value | $ | $ 2
United States agency debt securities |
Number of Investments | investment | 17
Fair Value | $ | $ 28
United States Treasury debt securities |
Number of Investments | investment | 25
Fair Value | $ | $ 74
Certificates of deposit |
Number of Investments | investment | 44
Fair Value | $ | $ 54

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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://www.xbrl.org/2003/role/presentationRef -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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