LEASES - FUTURE MATURITIES (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months	$ 251
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two	200
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three	163
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four	139
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five	105
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five	215
Lessee, Operating Lease, Liability, Payments, Due	1,073
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(146)
Operating Lease, Liability	$ 927
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$ 263
Operating Leases, Future Minimum Payments, Due in Two Years		209
Operating Leases, Future Minimum Payments, Due in Three Years		165
Operating Leases, Future Minimum Payments, Due in Four Years		141
Operating Leases, Future Minimum Payments, Due in Five Years		121
Operating Leases, Future Minimum Payments, Due Thereafter		244
Operating Leases, Future Minimum Payments Due		$ 1,143