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Financial Instruments (Tables)
6 Months Ended
Dec. 31, 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)
December 31,
2014
 
June 30,
2014
Estimated fair value
$
4,089

 
$
4,115

Carrying amount
3,976

 
3,972