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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 105.00% | 23.40% | 30.00% | 22.40% |
Gross unrecognized tax benefits | $ 69 |  | $ 69 |  | $ 67
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | 52 |  | 52 |  |
Gross interest and penalty accrued | 1 |  | 3 |  |
Total gross accrued interest and penalties related to unrecognized tax benefits | $ 13 |  | $ 13 |  | $ 12

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