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REVENUE RECOGNITION - Changes in Deferred Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Change in Contract with Customer, Liability [Abstract]        
Balance at the beginning of the period $ 409 $ 392 $ 279 $ 361
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (83) (83) (173) (243)
Revenue deferred during the period 92 112 308 307
Other 2 4 6 0
Balance at the end of the period $ 420 $ 425 $ 420 $ 425