Components of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Operating lease cost	$ 431	$ 395	$ 1,254	$ 1,182
Finance lease cost:
Amortization of right-of-use assets	100	70	262	175
Interest on lease liabilities	65	47	179	121
Total finance lease cost	$ 165	$ 117	$ 441	$ 296