Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 425	$ 388	$ 1,229	$ 1,132
Operating cash flows from finance leases	65	46	179	121
Financing cash flows from finance leases	66	37	167	93
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	730	570	1,698	1,269
Finance leases	$ 658	$ 412	$ 1,722	$ 1,790