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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 |

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