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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Income Tax Examination [Line Items]          
Effective tax rate (as a percent) 14.90% 30.80% 17.60% 26.20%  
Increase (decrease) in effective tax rate (as a percent) (15.90%)   (8.60%)    
Gross unrecognized tax benefits $ 70   $ 70   $ 70
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 55   55    
Total gross accrued interest and penalties related to unrecognized tax benefits $ 14   $ 14   $ 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) (1.60%)   (1.50%)    
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) (4.70%)   (2.80%)