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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Other Asset Impairment Charges        
LEASES        
Operating lease, impairment loss $ 33 $ 13 $ 33 $ 13