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Available-for-Sale Securities | 12 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Available-for-Sale Securities | Available-for-Sale Securities During fiscal 2015 and 2014, we purchased marketable securities, which are classified as available-for-sale and are carried at fair value in the consolidated balance sheets. We held the following investments in marketable securities at fair value at June 30:
(in millions) | 2015 |  | 2014
Current available-for-sale securities: |  |  |
Commercial paper | $ | 4 |  |  | $ | 4 |
Treasury bills | 12 |  |  | 85 |
International bonds | 2 |  |  | 1 |
Corporate bonds | 34 |  |  | 3 |
U.S. agency bonds | 5 |  |  | — |
Asset-backed securities | 8 |  |  | — |
U.S. agency mortgage-backed securities | 26 |  |  | — |
Total current available-for-sale securities | 91 |  |  | 93 |
Long-term available-for-sale securities: |  |  |
Corporate bonds | 33 |  |  | 5 |
U.S. agency bonds | 18 |  |  | 2 |
Asset-backed securities | 41 |  |  | — |
U.S. agency mortgage-backed securities | 10 |  |  | — |
Total long-term available-for-sale securities | 102 |  |  | 7 |
Total available-for-sale securities | $ | 193 |  |  | $ | 100 |
Gross unrealized gains and losses were immaterial at both June 30, 2015 and 2014. We did not recognize any other-than-temporary impairments during fiscal 2015 or 2014. At June 30, 2015, the weighted-average effective maturity of our current and long-term investments was approximately 8 months and 16 months, respectively.

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