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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
REVENUE RECOGNITION        
Allowance for doubtful accounts and customer deductions $ 76 $ 63    
Adjustment to retained earnings 4,481 3,962 $ 4,558  
Allowance for non-credit losses 30      
Retained Earnings        
REVENUE RECOGNITION        
Adjustment to retained earnings $ 10,480 10,134 $ 10,393 $ 9,984
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings        
REVENUE RECOGNITION        
Adjustment to retained earnings   (3)   $ (29)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Accounting Standards Update 2016-13        
REVENUE RECOGNITION        
Adjustment to retained earnings   $ (3)