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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Currency Translation and Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Currency Translation and Transactions      
Unrealized translation gains (losses), net of tax $ 147 $ (106) $ 30
Realized foreign currency gain on sale of foreign subsidiary reclassification from AOCI     77
Gross realized loss on sale of securities reclassification from AOCI     6
Net exchange gains (losses) on foreign currency transactions $ (12) $ 51 $ 46