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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

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