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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
REVENUE RECOGNITION            
Allowance for doubtful accounts and customer deductions $ 50   $ 63      
Adjustment to retained earnings 5,558   3,962 $ 4,358    
Allowance for non-credit losses 25          
Retained Earnings            
REVENUE RECOGNITION            
Adjustment to retained earnings $ 11,420 $ 11,159 10,134 $ 10,595 $ 10,775 $ 9,984
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings            
REVENUE RECOGNITION            
Adjustment to retained earnings   $ 0 (3)   $ 0 $ (29)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Accounting Standards Update 2016-13            
REVENUE RECOGNITION            
Adjustment to retained earnings     $ (3)