Financial Instruments (Tables)

3 Months Ended

Sep. 30, 2017

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)	September 30, 2017		June 30, 2017
Estimated fair value	$	10,333	$	10,713
Carrying amount	10,003		10,395