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RESTRUCTURING PROGRAM - RESTRUCTURING RESERVE BY TYPE OF COSTS (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
employee
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
employee
Jun. 30, 2019
USD ($)
Restructuring Reserve [Roll Forward]        
Reserve Balance $ 464   $ 464 $ 468
Restructuring Charges 105 $ 93 198  
Cash Spent     (129)  
Charges Against Assets     (73)  
Separations        
Restructuring Reserve [Roll Forward]        
Reserve Balance 281   281 280
Restructuring Charges $ 47 34    
Cash Spent     (80)  
Charges Against Assets     $ 0  
Restructuring and Related Cost, Number of Severance Packages Executed | employee 190   370  
Asset-related Costs        
Restructuring Reserve [Roll Forward]        
Reserve Balance $ 0   $ 0 0
Restructuring Charges 28 45    
Cash Spent     0  
Charges Against Assets     (73)  
Other Costs        
Restructuring Reserve [Roll Forward]        
Reserve Balance 183   183 $ 188
Restructuring Charges $ 30 $ 14    
Cash Spent     (49)  
Charges Against Assets     $ 0