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Financial Instruments (Tables)
3 Months Ended
Sep. 30, 2020
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, 2020June 30, 2020
Estimated fair value$7,245 $7,273 
Carrying amount6,740 6,775