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Marketable Securities And Cash Equivalents (Tables) | 6 Months Ended
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Dec. 31, 2012
Marketable Securities And Cash Equivalents [Abstract] |
Investments In Debt and Equity Securities |
|  |  |  | 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
|  |  |  | 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
|  |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  |  |  |  | (In millions) |  |  |
June 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  | $ | 753 |  | $ | - |  | $ | - |  | $ | 753
Maturity 1 to 5 years |  |  | 72 |  |  | 1 |  |  | - |  |  | 73
Government-sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  |  | 20 |  |  | - |  |  | - |  |  | 20
Maturity 1 to 5 years |  |  | 54 |  |  | - |  |  | - |  |  | 54
Maturity 5 to 10 years |  |  | 5 |  |  | - |  |  | - |  |  | 5
Maturity greater than 10 years |  |  | 218 |  |  | 8 |  |  | - |  |  | 226
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  |  | 1 |  |  | - |  |  | - |  |  | 1
Maturity 1 to 5 years |  |  | 35 |  |  | 1 |  |  | - |  |  | 36
Other debt securities |  |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year |  |  | 215 |  |  | - |  |  | - |  |  | 215
Maturity 1 to 5 years |  |  | 3 |  |  | - |  |  | - |  |  | 3
Maturity 5 to 10 years |  |  | 7 |  |  | - |  |  | - |  |  | 7
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |
Avaliable-for-sale |  |  | 159 |  |  | 83 |  |  | (4) |  |  | 238
Trading |  |  | 24 |  |  | - |  |  | - |  |  | 24
|  | $ | 1,566 |  | $ | 93 |  | $ | (4) |  | $ | 1,655

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