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Available-for-Sale Securities (Tables)
3 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
We held the following investments in marketable securities at fair value at:
(in millions)
September 30, 2017
 
June 30, 2017
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