Components of Lease Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease cost	$ 2,043	$ 1,707	$ 1,585
Finance lease cost:
Amortization of right-of-use assets	611	370	243
Interest on lease liabilities	336	247	175
Total finance lease cost	$ 947	$ 617	$ 418