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Available-for-Sale Securities | 6 Months Ended
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Dec. 31, 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) | December 31, 2016 |  | June 30, 2016
Current available-for-sale securities: |  |  |
Treasury bills | $ | — |  |  | $ | 3 |
International bonds | 3 |  |  | 2 |
Corporate bonds | 59 |  |  | 58 |
U.S. agency bonds | 11 |  |  | 6 |
Asset-backed securities | 26 |  |  | 28 |
International equity securities | 1 |  |  | 2 |
U.S. agency mortgage-backed securities | 10 |  |  | 14 |
Total current available-for-sale securities | 110 |  |  | 113 |
Long-term available-for-sale securities: |  |  |
Treasury bills | 24 |  |  | 10 |
International bonds | 3 |  |  | 1 |
Corporate bonds | 29 |  |  | 36 |
U.S. agency bonds | — |  |  | 9 |
Asset-backed securities | 16 |  |  | 17 |
U.S. agency mortgage-backed securities | 19 |  |  | 14 |
Total long-term available-for-sale securities | 91 |  |  | 87 |
Total available-for-sale securities | $ | 201 |  |  | $ | 200 |
Gross unrealized gains and losses on available-for-sale securities were immaterial at both December 31, 2016 and June 30, 2016. During the six months ended December 31, 2016 and 2015, gross realized gains and losses on available-for-sale securities were immaterial and we did not recognize any other-than-temporary impairments. At December 31, 2016, the weighted-average effective maturity of our current and long-term marketable securities was approximately 6 months and 16 months, respectively.

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