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Available-for-Sale Securities
 12 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-Sale Securities
6. 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)
2018
 
2017
Current available-for-sale securities:
 
 
 
Treasury bills
—

 
25

International bonds
—

 
3

Corporate bonds
—

 
30

U.S. agency bonds
—

 
3

Asset-backed securities
—

 
3

International equity securities
—

 
1

Total available-for-sale securities
$
—

 
$
65


In July 2017, we liquidated our marketable securities. There were no unrealized gains or losses at June 30, 2018 and unrealized gains and losses were immaterial at June 30, 2017. During fiscal 2018, 2017 and 2016, gross realized gains and losses were immaterial and we did not recognize any other-than-temporary-impairments.