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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Currency Translation and Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Currency Translation and Transactions |  |  |  |
Unrealized translation gains (losses), net of tax | $ 227 | $ 75 | $ 318 | $ 3
Net exchange gains (losses) on foreign currency transactions |  | $ 27 | $ (2) | $ 24

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