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Available-for-Sale Securities (Schedule of Available-for-Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities $ 91 [1] $ 100 [1]
Available-for-sale Securities, Current 25 93
Available-for-sale Securities, Noncurrent 66 7
Commercial Paper
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 15 4
Treasury bills
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 3 85
International bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 1 1
Corporate bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 4 3
Available-for-sale Securities, Noncurrent 10 5
U.S. agency bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Noncurrent 43 2
U.S. agency mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 2 0
Available-for-sale Securities, Noncurrent $ 13 $ 0
[1] We invest in marketable securities, which are classified as available-for-sale and are carried at fair value in the condensed consolidated balance sheets. Observable Level 2 inputs such as quoted prices for similar securities, interest rate spreads, yield curves and credit risk are used to determine the fair value. See Note 5 for additional information regarding available-for-sale securities.