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Income Tax - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |
Net discrete tax (benefits) expense related to tax settlements | $ 7 | $ 3
Uncertain tax positions from expirations of statute of limitations | $ 1 | $ 1
United States Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Tax years remain subject to examination | 2020 |
United States Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Tax years remain subject to examination | 2022 |
State Tax Authorities [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Tax years remain subject to examination | 2016 |
State Tax Authorities [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Tax years remain subject to examination | 2022 |
Foreign Jurisdictions [Member] | Earliest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Tax years remain subject to examination | 2006 |
Foreign Jurisdictions [Member] | Latest Tax Year [Member] |  |
Income Taxes [Line Items] |  |
Tax years remain subject to examination | 2022 |

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