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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Currency Translation and Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Currency Translation and Transactions      
Unrealized translation gains (losses), net of tax $ 90 $ (135) $ (85)
Net exchange gains (losses) on foreign currency transactions $ 58 $ 77 $ 57