Components of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 553	$ 522	$ 1,554	$ 1,465
Finance lease cost:
Amortization of right-of-use assets	211	135	666	423
Interest on lease liabilities	100	87	286	249
Total finance lease cost	$ 311	$ 222	$ 952	$ 672