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Marketable Securities And Cash Equivalents (Tables) | 3 Months Ended
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Mar. 31, 2013
Marketable Securities And Cash Equivalents [Abstract] |
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

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