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Available-for-Sale Securities | 3 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Available-for-Sale Securities | 5. Available-for-Sale Securities We invest in marketable securities, which are classified as available-for-sale and are carried at fair value in the condensed consolidated balance sheets. We held the following investments in marketable securities at fair value at:
(in millions) | September 30, 2016 |  | June 30, 2016
Current available-for-sale securities: |  |  |
Treasury bills | $ | — |  |  | $ | 3 |
International bonds | 3 |  |  | 2 |
Corporate bonds | 58 |  |  | 58 |
U.S. agency bonds | 7 |  |  | 6 |
Asset-backed securities | 31 |  |  | 28 |
International equity securities | 2 |  |  | 2 |
U.S. agency mortgage-backed securities | 7 |  |  | 14 |
Total current available-for-sale securities | 108 |  |  | 113 |
Long-term available-for-sale securities: |  |  |
Treasury bills | 29 |  |  | 10 |
International bonds | 3 |  |  | 1 |
Corporate bonds | 32 |  |  | 36 |
U.S. agency bonds | 8 |  |  | 9 |
Asset-backed securities | 8 |  |  | 17 |
U.S. agency mortgage-backed securities | 12 |  |  | 14 |
Total long-term available-for-sale securities | 92 |  |  | 87 |
Total available-for-sale securities | $ | 200 |  |  | $ | 200 |
Gross unrealized gains and losses were immaterial at both September 30, 2016 and June 30, 2016. During the three months ended September 30, 2016 and 2015, gross realized gains and losses were immaterial and we did not recognize any other-than-temporary impairments. At September 30, 2016, the weighted-average effective maturity of our current and long-term investments was approximately 6 months and 17 months, respectively.

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