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REVENUE RECOGNITION - Changes in Allowance for Credit Losses (Details)
$ in Millions
6 Months Ended
Dec. 31, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at June 30, 2020 $ 36
Provision for expected credit losses 7
Write-offs, net & other (8)
Balance at December 31, 2020 39
Cumulative Effect, Period of Adoption, Adjustment  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at June 30, 2020 $ 4