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Goodwill and Other Intangibles - Additional Information (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) ReportableSegment | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) ReportableSegment | Jun. 30, 2019 USD ($)
Schedule Of Goodwill And Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Number of reportable segments | ReportableSegment |  | 5 |  | 5 |
Impairment | $ 0 |  | $ 0 | $ 530,000,000 | $ 0
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Amortization expense recognized on intangible assets | 21,000,000 |  | $ 22,000,000 | 63,000,000 | $ 65,000,000
Expected future amortization expense [Abstract] |  |  |  |  |
2020 (includes nine months actual and three months estimated) | 85,000,000 |  |  | 85,000,000 |
2021 | 85,000,000 |  |  | 85,000,000 |
2022 | 84,000,000 |  |  | 84,000,000 |
2023 | 84,000,000 |  |  | 84,000,000 |
2024 | 70,000,000 |  |  | 70,000,000 |
Trademarks and Trade Names [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Impairment |  |  |  | $ 0 |
Minimum [Member] | Trademarks and Trade Names [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Useful life (in years) |  |  |  | 3 years |
Minimum [Member] | Intellectual Property [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Useful life (in years) |  |  |  | 5 years |
Minimum [Member] | Customer and Supplier Relationships [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Useful life (in years) |  |  |  | 3 years |
Maximum [Member] | Trademarks and Trade Names [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Useful life (in years) |  |  |  | 25 years |
Maximum [Member] | Intellectual Property [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Useful life (in years) |  |  |  | 25 years |
Maximum [Member] | Customer and Supplier Relationships [Member] |  |  |  |  |
Intangible Assets, Net [Abstract] |  |  |  |  |
Useful life (in years) |  |  |  | 24 years |
Former Reporting Unit [Member] |  |  |  |  |
Schedule Of Goodwill And Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment |  | $ 0 |  |  |
New Reporting Unit [Member] |  |  |  |  |
Schedule Of Goodwill And Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment |  | $ 530,000,000 |  | $ 530,000,000 |
Personal Care & Household [Member] |  |  |  |  |
Schedule Of Goodwill And Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment | $ 0 |  |  | $ 356,000,000 |

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