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Marketable Securities And Cash Equivalents | 3 Months Ended
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Mar. 31, 2013
Marketable Securities And Cash Equivalents [Abstract] |
Marketable Securities And Cash Equivalents | Note 6. Marketable Securities and Cash Equivalents
|  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  |  |  |  | (In millions) |  |  |
March 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  | $ | 375 |  | $ | - |  | $ | - |  | $ | 375
Maturity 1 to 5 years |  |  | 90 |  |  | - |  |  | - |  |  | 90
Government-sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years |  |  | 3 |  |  | - |  |  | - |  |  | 3
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years |  |  | 14 |  |  | - |  |  | - |  |  | 14
Other debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  |  | 645 |  |  | - |  |  | - |  |  | 645
Maturity 1 to 5 years |  |  | 3 |  |  | - |  |  | - |  |  | 3
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  | 611 |  |  | - |  |  | (38) |  |  | 573
|  | $ | 1,741 |  | $ | - |  | $ | (38) |  | $ | 1703
|  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  |  |  |  | (In millions) |  |  |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  | $ | 583 |  | $ | - |  | $ | - |  | $ | 583
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 |  |  | 1,038 |  |  | - |  |  | - |  |  | 1,038
Maturity 1 to 5 years |  |  | 3 |  |  | - |  |  | - |  |  | 3
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  | 606 |  |  | 3 |  |  | (5) |  |  | 604
|  | $ | 2,340 |  | $ | 3 |  | $ | (5) |  | $ | 2,338
All of the $38 million in unrealized losses at March 31, 2013, arose w ithin the last 12 months and are related to the Company’s investment in t hree available-for-sale equity securities with a market value of $571 million. The Company evaluated the near-term prospects of the issuer s in relation to the severity and duration of the impairment. Based on that evaluation and the Company’s ability and intent to hold these investment s for a reasonable period of time sufficient for a forecasted recovery of fair value, th e Company does not consider these investment s to be other-than-temporarily impaired at March 31, 2013.

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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 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 2: 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 3: 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 4: 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=6872113&loc=d3e27161-111563 Reference 5: 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 6: 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 + Details
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