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SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ (1,040) |  |  | $ (883) |  |  | $ (3,128) | $ (2,263) |  |
Net income | (84) | $ (96) | $ (112) | (48) | $ 92 | $ 134 | (292) | 178 |  |
Retained earnings | 1,419 |  |  |  |  |  | 1,419 |  | $ 1,198 |
Inventories, net | 548 |  | $ 1 |  |  |  | 548 |  | 476 |
Inventory adjustments | 4 |  |  |  |  |  | 4 |  |  |
Adjustment |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 29 |  |  | 12 |  |  | 35 | (3) |  |
Net income | 19 |  |  | $ 6 |  |  | 27 | $ (4) |  |
Retained earnings | (62) |  |  |  |  |  | (62) |  | (35) | $ 45
Inventories, net | 16 |  |  |  |  |  | $ 16 |  | $ 10 |
Adjustment | Product Exchanges Incorrectly Accounted For |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 4 |  |  |  |  |  |  |  |  |

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