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REVENUE RECOGNITION - Changes in Deferred Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Significant changes in deferred revenue    
Balance at the beginning of the period $ 279 $ 361
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (201) (271)
Revenue deferred during the period 294 189
Other (1) 0
Balance at the end of the period $ 371 $ 279