Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 407	$ 375	$ 804	$ 744
Operating cash flows from finance leases	59	45	114	75
Financing cash flows from finance leases	54	31	101	56
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	472	308	968	699
Finance leases	$ 645	$ 650	$ 1,064	$ 1,378