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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
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

X

- 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

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X

- 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

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