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Marketable Securities | 12 Months Ended
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Dec. 31, 2013
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, 2013 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 395 |  |  | $ | — |  |  | $ | — |  |  | $ | 395 |
Maturity 1 to 5 years | 124 |  |  | — |  |  | — |  |  | 124 |
Government-sponsored enterprise obligations |  |  |  |  |  |  |
Maturity 1 to 5 years | 4 |  |  | — |  |  | — |  |  | 4 |
Corporate debt securities |  |  |  |  |  |  |
Maturity 1 to 5 years | 16 |  |  | — |  |  | — |  |  | 16 |
Other debt securities |  |  |  |  |  |  |
Maturity less than 1 year | 38 |  |  | — |  |  | — |  |  | 38 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |
Available-for-sale | 362 |  |  | 1 |  |  | (2 | ) |  | 361 |
| $ | 942 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 941 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2012 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 548 |  |  | $ | — |  |  | $ | — |  |  | $ | 548 |
Maturity 1 to 5 years | 93 |  |  | — |  |  | — |  |  | 93 |
Government-sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 2 |  |  | — |  |  | — |  |  | 2 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 15 |  |  | — |  |  | — |  |  | 15 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 28 |  |  | — |  |  | — |  |  | 28 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 606 |  |  | 3 |  |  | (5 | ) |  | 604 |
| $ | 1,295 |  |  | $ | 3 |  |  | $ | (5 | ) |  | $ | 1,293 |
All of the $2 million in unrealized losses at December 31, 2013, arose within the last 12 months and are related to the Company’s investment in one security. The market value of the available-for-sale equity security that has been in an unrealized loss position for less than 12 months is $5 million. The Company evaluated the near-term prospects of the issuer in relation to the severity and duration of the impairment. Based on that evaluation and the Company’s ability and intent to hold this investment for a reasonable period of time sufficient for a forecasted recovery of fair value, the Company does not consider this investment to be other-than-temporarily impaired at December 31, 2013. For information on other-than-temporary impairment charges, see Note 19.

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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 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: 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=6871852&loc=d3e26626-111562 Reference 3: 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 4: 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 Reference 5: 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=27724398&loc=d3e27232-111563 Reference 6: 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=27724398&loc=d3e27161-111563 + Details
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