Financial Instruments (Tables)

9 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Estimated Fair Value of Long-term Obligations and Other Short-term Borrowings Compared to the Respective Carrying Amount

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)	March 31, 2018		June 30, 2017
Estimated fair value	$	9,576	$	10,713
Carrying amount	9,578		10,395