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Available-for-Sale Securities | 12 Months Ended
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Jun. 30, 2017
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 consolidated balance sheets. We held the following investments in marketable securities at fair value at June 30:
(in millions) | 2017 |  | 2016
Current available-for-sale securities: |  |  |
Commercial paper | $ | — |  |  | $ | — |
Treasury bills | 25 |  |  | 3 |
International bonds | 3 |  |  | 2 |
Corporate bonds | 30 |  |  | 58 |
U.S. agency bonds | 3 |  |  | 6 |
Asset-backed securities | 3 |  |  | 28 |
International equity securities | 1 |  |  | 2 |
U.S. agency mortgage-backed securities | — |  |  | 14 |
Total current available-for-sale securities | 65 |  |  | 113 |
Long-term available-for-sale securities: |  |  |
Treasury bills | — |  |  | 10 |
International bonds | — |  |  | 1 |
Corporate bonds | — |  |  | 36 |
U.S. agency bonds | — |  |  | 9 |
Asset-backed securities | — |  |  | 17 |
U.S. agency mortgage-backed securities | — |  |  | 14 |
Total long-term available-for-sale securities | — |  |  | 87 |
Total available-for-sale securities | $ | 65 |  |  | $ | 200 |
Gross unrealized gains and losses were immaterial at both June 30, 2017 and 2016. During fiscal 2017, 2016 and 2015 gross realized gains and losses were immaterial and we did not recognize any other-than-temporary-impairments. At June 30, 2017, the weighted-average effective maturity of our current investments is approximately 7 months.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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