Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 491	$ 453
Operating cash flows from finance leases	92	78
Financing cash flows from finance leases	136	79
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	678	983
Finance leases	$ 635	$ 1,489