LEASES - General (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jul. 01, 2019	Jun. 30, 2019	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Cumulative adjust, reduction of opening balance of retained earnings	$ (3,962)		$ (4,411)	$ (4,710)
Operating lease right-of-use assets	2,282	$ 2,598
Operating lease, liability	$ 2,653	$ 2,764
Lease renewal term	30 years
Lease termination period	23 years
Impairment of long-lived assets	$ 215
Operating lease, impairment loss	131
Operating lease obligation not yet commenced	103
Finance lease obligation not yet commenced	1
Property, Plant and Equipment, and Other Long-lived Assets
Lessee, Lease, Description [Line Items]
Impairment of long-lived assets	$ 84
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Cumulative adjust, reduction of opening balance of retained earnings			$ 29
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Operating lease term not yet commenced	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	59 years
Operating lease term not yet commenced	20 years