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Acquisitions - Additional Information (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 17, 2017 USD ($) Facility | Jan. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 2,315 | $ 2,304 | $ 2,253
Pharmachem [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, revenue reported by acquired entity for last annual period | $ 300 |  |  |  |
Number of manufacturing facilities | Facility | 14 |  |  |  |
Business acquisition, purchase price in cash | $ 680 |  |  |  |
Working capital adjustments | 20 |  |  |  |
Business acquisition, transaction costs | 5 |  |  |  |
Finite-lived intangible assets, purchase accounting adjustments |  |  | 18 |  |
Goodwill, purchase accounting adjustments |  |  | $ 11 | 1 |
Property, plant and equipment, purchase accounting adjustments |  |  |  | 3 |
Accounts payable, purchase accounting adjustments |  |  |  | 1 |
Deferred tax liabilities, purchase accounting adjustments |  |  |  | 6 |
Other non current asset, purchase accounting adjustments |  |  |  | $ 3 |
Intangible assets | 330 |  |  |  |
Goodwill | $ 288 |  |  |  |
Vornia Limited [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, consideration transferred |  | $ 12 |  |  |
Business acquisition future payment |  | 1 |  |  |
Intellectual property |  | 8 |  |  |
Goodwill |  | $ 4 |  |  |

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