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Available-for-Sale Securities (Tables)
 12 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
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