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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Accounting Policies (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, increase 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, increase 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, increase to opening balance of retained earnings   $ (3) $ (29) $ (229)
Accounting Standards Update 2019-12 | Cumulative effect of adoption of new accounting standards | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative adjustment, increase to opening balance of retained earnings $ 120