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Cash and Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Cash and Marketable Securities [Abstract] |
Schedule Of Amortized Cost, Fair Value And Gross Unrealized Gains And Losses Of The Company's Short- And Long-Term Investments |
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
(In millions) |  | Cost |  | Gains |  | Losses |  | Value
Available-for-sale securities, September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 7 |  | $ | — |  | $ | — |  | $ | 7
Available-for-sale securities, December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 9 |  | $ | — |  | $ | — |  | $ | 9
Schedule Of Proceeds From Sale Of Securities, Maturities Of Available-for-sale Securities And Gross Realized (Gains) Losses |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
(In millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Proceeds from sale of securities |  | $ | — |  | $ | 16 |  | $ | — |  | $ | 17
Maturities of securities |  |  | 5 |  |  | 6 |  |  | 9 |  |  | 15

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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