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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) | 30.80% | 22.90% | 26.20% | 21.90% |
Gross unrecognized tax benefits | $ 67 |  | $ 67 |  | $ 67
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | 50 |  | 50 |  |
Gross interest and penalty accrued | 1 |  | 2 |  |
Total gross accrued interest and penalties related to unrecognized tax benefits | $ 12 |  | $ 12 |  | $ 12

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