Financial Instruments (Tables)

6 Months Ended

Dec. 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)	December 31, 2018		June 30, 2018
Estimated fair value	$	8,717	$	8,852
Carrying amount	9,049		9,013