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REVENUE - Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at January 1 $ 7 $ 5
Provision for expected credit losses during the period 1 3
Write-offs charged against the allowance (2) (2)
Recoveries of amounts previously written off 1 1
Other (1) 0
Balance at end of year 6 7
Financing receivable, allowance for credit losses, disposal group 1 $ 0
Hüppe    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Other (1)  
Financing receivable, allowance for credit losses, disposal group $ 1