Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 375	$ 314	$ 744	$ 581
Operating cash flows from finance leases	45	15	75	27
Financing cash flows from finance leases	31	9	56	15
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	308	119	699	174
Finance leases	$ 650	$ 498	$ 1,378	$ 765