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Income Tax - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Income Taxes [Line Items] |  |  |  |
Net discrete tax (benefits) expense related to tax settlements | $ 1 | $ (1) | $ (36) | $ 1
Uncertain tax positions from expirations of statute of limitations | 1 |  | $ 2 | $ 1
United States Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years remain subject to examination |  |  | 2018 |
United States Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years remain subject to examination |  |  | 2020 |
State Tax Authorities [Member] | Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years remain subject to examination |  |  | 2005 |
State Tax Authorities [Member] | Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years remain subject to examination |  |  | 2020 |
Non-U.S. Jurisdictions [Member] | Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years remain subject to examination |  |  | 2005 |
Non-U.S. Jurisdictions [Member] | Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years remain subject to examination |  |  | 2021 |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Uncertain tax positions from expirations of statute of limitations |  | $ 1 |  |
Purification Solutions [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net discrete tax (benefits) expense related to tax settlements | $ 36 |  |  |
Income tax benefit from tax loss related to divestiture |  |  | $ 183 |

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