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REVENUE RECOGNITION - Activity in Allowance for Credit Losses (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 48
Retrospective effect of application of new accounting standard 1
Provision 6
Write-offs (2)
Recoveries 1
Foreign exchange and other (2)
Ending balance $ 52