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LEASES - Total Lease Costs and Other Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Total lease cost    
Finance lease cost - amortization of right-of-use assets $ 3 $ 6
Operating lease cost 115 233
Short-term lease cost 9 15
Variable lease cost 49 92
Total $ 176 346
Other information    
Operating cash flows from operating leases   242
Financing cash flows from finance leases   8
Right-of-use assets obtained in exchange for new operating lease liabilities   $ 110
Weighted-average remaining lease term - finance leases 2 years 2 years
Weighted-average remaining lease term - operating leases 11 years 11 years
Weighted-average discount rate - finance leases 2.70% 2.70%
Weighted-average discount rate - operating leases 2.50% 2.50%