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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Income Tax Examination [Line Items]          
Effective tax rate (as a percent) 21.00% 105.00% 18.50% 30.00%  
Increase (decrease) in effective tax rate (as a percent) (84.00%)   (11.50%)    
Gross unrecognized tax benefits $ 72   $ 72   $ 70
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 57   57    
Gross interest and penalty accrued 2   3    
Total gross accrued interest and penalties related to unrecognized tax benefits $ 16   $ 16   $ 13
Internal Revenue Service (IRS) | Fiscal Year 2021          
Income Tax Examination [Line Items]          
Tax cuts and jobs act, change in enacted rate after application of GILTI (as a percent) (1.00%)   (1.10%)    
Internal Revenue Service (IRS) | Fiscal Year 2020 and 2019          
Income Tax Examination [Line Items]          
Tax cuts and jobs act, change in enacted rate after application of GILTI (as a percent) (0.30%)   (2.20%)