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Marketable Securities And Cash Equivalents (Tables) | 3 Months Ended
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Sep. 30, 2012
Marketable Securities And Cash Equivalents [Abstract] |
Investments In Debt And Equity Securities |
|  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  |  |  |  | (In millions) |  |  |
September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  | $ | 698 |  | $ | - |  | $ | - |  | $ | 698
Maturity 1 to 5 years |  |  | 96 |  |  | 1 |  |  | - |  |  | 97
Government-sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years |  |  | 3 |  |  | - |  |  | - |  |  | 3
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years |  |  | 8 |  |  | - |  |  | - |  |  | 8
Other debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  |  | 671 |  |  | - |  |  | - |  |  | 671
Maturity 1 to 5 years |  |  | 3 |  |  | - |  |  | - |  |  | 3
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  | 122 |  |  | - |  |  | (12) |  |  | 110
Trading |  |  | 25 |  |  | - |  |  | - |  |  | 25
|  | $ | 1,626 |  | $ | 1 |  | $ | (12) |  | $ | 1,615
|  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  |  |  |  | (In millions) |  |  |
June 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  | $ | 562 |  | $ | - |  | $ | - |  | $ | 562
Maturity 1 to 5 years |  |  | 87 |  |  | 1 |  |  | - |  |  | 88
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years |  |  | 24 |  |  | - |  |  | - |  |  | 24
Other debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  |  | 385 |  |  | - |  |  | - |  |  | 385
Maturity 1 to 5 years |  |  | 4 |  |  | - |  |  | - |  |  | 4
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  | 124 |  |  | 2 |  |  | (4) |  |  | 122
Trading |  |  | 24 |  |  | - |  |  | - |  |  | 24
|  | $ | 1,210 |  | $ | 3 |  | $ | (4) |  | $ | 1,209

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