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Available-for-Sale Securities
 3 Months Ended
Sep. 30, 2014
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)
September 30, 2014
 
June 30, 2014
Current available-for-sale securities:
 
 
 
Commercial paper
$
15

 
$
4

Treasury bills
3

 
85

International bonds
1

 
1

Corporate bonds
4

 
3

U.S. agency mortgage-backed securities
2

 
—

Total current available-for-sale securities
25

 
93

 
 
 
 
Long-term available-for-sale securities:
 
 
 
Corporate bonds
10

 
5

U.S. agency bonds
43

 
2

U.S. agency mortgage-backed securities
13

 
—

Total long-term available-for-sale securities
66

 
7

Total available-for-sale securities
$
91

 
$
100


Gross unrealized gains and losses were immaterial at September 30, 2014. During the three months ended September 30, 2014, gross realized gains and losses were immaterial and we did not recognize any other-than-temporary impairments. At September 30, 2014 the weighted-average effective maturity of our current and long-term investments was approximately 5 months and 17 months, respectively.