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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative adjustment, reduction to opening balance of retained earnings $ (6,091) $ (3,962) $ (4,411)  
Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative adjustment, reduction to opening balance of retained earnings $ (12,244) (10,134) (9,984) $ (9,040)
Cumulative effect of adoption of new accounting standards | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative adjustment, reduction to opening balance of retained earnings   $ 3 $ 29 229
Cumulative effect of adoption of new accounting standards | Accounting Standards Update 2014-09 | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative adjustment, reduction to opening balance of retained earnings       $ 229