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Fair Value Measurements (Unrealized Losses And Fair Value Of Investments With Unrealized Losses) (Details) $ in Millions | Mar. 31, 2017 USD ($) investment
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Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | investment | 60
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ | $ 34
Corporate and asset-backed debt securities |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | investment | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ | $ 1
United States agency debt securities |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | investment | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ | $ 8
United States treasury debt securities |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | investment | 20
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ | $ 16
Certificates of deposit |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | investment | 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ | $ 9

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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=73527792&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=73527792&loc=d3e27290-111563 + Details
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