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Marketable Securities And Cash Equivalents (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities and Cash Equivalents |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
September 30, 2013 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 465 |  |  | $ | — |  |  | $ | — |  |  | $ | 465 |
Maturity 1 to 5 years | 127 |  |  | — |  |  | — |  |  | 127 |
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 | 2,440 |  |  | — |  |  | — |  |  | 2,440 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |
Available-for-sale | 538 |  |  | 2 |  |  | (2 | ) |  | 538 |
| $ | 3,590 |  |  | $ | 2 |  |  | $ | (2 | ) |  | $ | 3,590 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair 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 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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