Components of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Leases [Abstract]
Operating lease cost	$ 395	$ 321	$ 1,182	$ 1,015
Finance lease cost:
Amortization of right-of-use assets	70	29	175	67
Interest on lease liabilities	47	19	121	46
Total finance lease cost	$ 117	$ 48	$ 296	$ 113