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Financial Instruments (Tables)
3 Months Ended
Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of the estimated fair value of our long-term obligations and other short-term borrowings compared to the respective carrying amounts
The following table summarizes the estimated fair value of our long-term obligations and other short-term borrowings compared to the respective carrying amounts at:
(in millions)
September 30,
2014
 
June 30,
2014
Estimated fair value
$
4,122

 
$
4,115

Carrying amount
4,007

 
3,972