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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted and Issued Accounting Standards (Details) - USD ($)
$ in Millions
Jul. 01, 2021
Mar. 31, 2021
Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   $ 11,420 $ 10,134
Cumulative Effect, Period of Adoption, Adjustment | Forecast | Accounting Standards Update 2019-12      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 120