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Available-for-Sale Securities | 9 Months Ended
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Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Available-for-Sale Securities Disclosure | 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) | March 31, 2015 |  | June 30, 2014
Current available-for-sale securities: |  |  |
Commercial paper | $ | 9 |  |  | $ | 4 |
Treasury bills | — |  |  | 85 |
International bonds | 1 |  |  | 1 |
Corporate bonds | 4 |  |  | 3 |
U.S. agency bonds | 10 |  |  | — |
U.S. agency mortgage-backed securities | 11 |  |  | — |
Total current available-for-sale securities | 35 |  |  | 93 |
Long-term available-for-sale securities: |  |  |
Corporate bonds | 7 |  |  | 5 |
U.S. agency bonds | 26 |  |  | 2 |
U.S. agency mortgage-backed securities | 16 |  |  | — |
Total long-term available-for-sale securities | 49 |  |  | 7 |
Total available-for-sale securities | $ | 84 |  |  | $ | 100 |
Gross unrealized gains and losses were immaterial at March 31, 2015. During the three and nine months ended March 31, 2015, gross realized gains and losses were immaterial and we did no t recognize any other-than-temporary impairments. At March 31, 2015, the weighted-average effective maturity of our current and long-term investments was approximately 6 months and 15 months, respectively.

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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 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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