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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities The following table sets forth items in short-term and long-term investments.
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2017 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity 1 to 5 years | $ | 92 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 91 |
Corporate debt securities |  |  |  |  |  |  |
Maturity 1 to 5 years | 1 |  |  | — |  |  | — |  |  | 1 |
| $ | 93 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 92 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2016 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 287 |  |  | $ | — |  |  | $ | — |  |  | $ | 287 |
Maturity 1 to 5 years | 121 |  |  | — |  |  | (1 | ) |  | 120 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 1 |  |  | — |  |  | — |  |  | 1 |
Maturity 1 to 5 years | 66 |  |  | — |  |  | — |  |  | 66 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 8 |  |  | — |  |  | — |  |  | 8 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 1 |  |  | — |  |  | — |  |  | 1 |
| $ | 484 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 483 |
The $1 million in unrealized losses at December 31, 2017 arose within the last 12 months and is related to the Company’s investment in one available-for-sale debt security with a fair value of $37 million. The contractual terms of this investment do not permit the issuer to settle the securities at a price less than the amortized cost basis of the investment. Because the Company does not intend to sell the investment and it is not more likely than not that it will be required to sell the investment before recovery of its amortized cost basis, which may be at maturity, the Company does not consider this investment to be other-than-temporarily impaired at December 31, 2017. For information on other-than temporary impairment charges, see Note 18.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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