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STOCK PROGRAMS - Long-term Performance Share Units (Details) - Common Class A
$ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
item
shares
Jan. 31, 2018
shares
Jan. 31, 2016
item
shares
Sep. 30, 2015
item
shares
Jun. 30, 2018
shares
Jun. 30, 2017
shares
Jun. 30, 2016
shares
Jan. 28, 2016
USD ($)
Sep. 04, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award                  
Common Stock issued (in shares)         5,087,400 5,038,500 3,411,900    
Long-term Performance Share Units | Executive                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares) 195,940   71,694 387,848          
Number of tranches | item 2   3 3          
Business days to make tranche payment     30 days            
Grant date fair value (in USD) | $ $ 27             $ 6 $ 30
Common Stock issued (in shares)   23,898              
Long-term Performance Share Units | Executive | Performance period ending June 30, 2018                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares)       129,283          
Long-term Performance Share Units | Executive | Performance period ending June 30, 2019                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares)       129,283          
Long-term Performance Share Units | Executive | Performance period ending June 30, 2020                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares)       129,283          
Long-term Performance Share Units | Executive | Performance period ending January 29, 2018                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares)     23,898            
Long-term Performance Share Units | Executive | Performance period ending January 29, 2019                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares)     23,898            
Long-term Performance Share Units | Executive | Performance period ending January 29, 2020                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares)     23,898            
Long-term Performance Share Units | Executive | Performance period ending June 30, 2021                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares) 97,970                
Long-term Performance Share Units | Executive | Performance period ending June 30, 2022                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Payout for performance share units in Class A Common Stock (in shares) 97,970