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STOCK PROGRAMS - Compensation Expense and Stock Options (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award        
Compensation expense $ 83 $ 73 $ 139 $ 131
Income tax benefit $ 15 $ 13 $ 26 $ 25
Stock Options | Common Class A        
Share-based Compensation Arrangement by Share-based Payment Award        
Grant at fair value (in shares)     1.3  
Exercise price (in dollars per share)     $ 199.24  
Weighted-average grant date fair value (in dollars per share)     $ 51.44  
Additional General Disclosures        
Intrinsic value of stock options exercised (in dollars)     $ 144