Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jul. 01, 2019	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Stockholders' equity	$ 10,311	$ 9,146	$ 8,389		$ 10,477
Operating leases expense	195
Retained Earnings
Lessee, Lease, Description [Line Items]
Stockholders' equity	(1,979)	$ (2,911)	$ (3,241)		(2,163)
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Stockholders' equity	9				20
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Lessee, Lease, Description [Line Items]
Stockholders' equity	$ 6				$ 32
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02 | Retained Earnings
Lessee, Lease, Description [Line Items]
Stockholders' equity				$ 9