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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Currency Translation and Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Currency Translation and Transactions        
Unrealized translation gains (losses), net of tax $ (20) $ 227 $ (195) $ 318
Net exchange gains (losses) on foreign currency transactions $ (6) $ 0 $ (18) $ (2)