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SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Significant Accounting Policies [Line Items] |  |  |
Inventories, net | $ 532 | $ 1 | $ 466
Inventory adjustments | 4 |  |
Trade Accounts Receivable |  |  |
Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts and trade discounts | $ 14 |  | $ 18

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