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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Currency Translation and Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Currency Translation and Transactions        
Unrealized translation gains (losses), net of tax $ (143) $ (173) $ 175 $ (170)
Net exchange gains (losses) on foreign currency transactions $ (3) $ 15 $ (5) $ 40