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OTHER (INCOME) EXPENSE, NET - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 20, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021
Schedule Of Other Income And Expenses [Line Items] |  |  |  |  |  |
Milestone achievement, included in net (loss) gain on sale of assets |  | $ (21) | $ 0 | $ 2 | $ 1 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun |  |  |  |  |  |
Schedule Of Other Income And Expenses [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  | $ 26 |  |  |  | $ 210
Milestone Payment Related To Certain Product |  |  |  |  |  |
Schedule Of Other Income And Expenses [Line Items] |  |  |  |  |  |
Milestone achievement, included in net (loss) gain on sale of assets |  |  |  | $ 25 |  |
Insurance Coverage Lawsuit | Settled Litigation |  |  |  |  |  |
Schedule Of Other Income And Expenses [Line Items] |  |  |  |  |  |
Aggregate amount to be received | $ 213 |  |  |  |  |

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