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REVENUE - Changes in the allowance for credit losses (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at January 1 $ 6 $ 7
Provision for expected credit losses during the period 2 1
Write-offs charged against the allowance (1) (2)
Recoveries of amounts previously written off 1 1
Other 0 1
Balance at end of period $ 8 6
Hüppe    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, disposal group   $ 1