LEASES - Total Lease Costs and Other Information (Details) $ in Millions	12 Months Ended
	Jun. 30, 2020 USD ($)
Finance lease cost:
Amortization of right-of-use assets	$ 11
Interest on lease liabilities	1
Operating lease cost	625
Short-term lease cost	24
Variable lease cost	158
Total	819
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	426
Financing cash flows from finance leases	12
Right-of-use assets obtained in exchange for new operating lease liabilities	266
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 1
Weighted-average remaining lease term – finance leases	2 years
Weighted-average remaining lease term – operating leases	11 years
Weighted-average discount rate – finance leases	2.70%
Weighted-average discount rate – operating leases	2.50%