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Fair Value Measurements (Unrealized Losses And Fair Value Of Investments With Unrealized Losses) (Details) $ in Millions	Sep. 30, 2019 USD ($) investment
Number of Investments | investment	10
Fair Value | $	$ 12
Corporate and asset-backed debt securities
Number of Investments | investment	4
Fair Value | $	$ 1
United States agency debt securities
Number of Investments | investment	1
Fair Value | $	$ 1
United States Treasury debt securities
Number of Investments | investment	5
Fair Value | $	$ 10

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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

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