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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jul. 01, 2019
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)  
Operating lease right-of-use assets 2,190 2,282 $ 2,598    
Operating lease, liability 2,530 2,653 $ 2,764    
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 2016-02 | Retained earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative adjustment, reduction to opening balance of retained earnings       $ 29