Income Tax - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Taxes [Line Items]
Net discrete tax (benefits) expense related to tax settlements		$ 14		$ (22)
Tax expense related to withholding tax accruals on historic earnings due to changes in indefinite reinvestment assertion on certain entities	$ 2		$ 3	8
Uncertain tax positions from expirations of statute of limitations	$ 0	$ 0	$ 1	2
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			2013
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			2005
Foreign Jurisdictions [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination			2022
Purification Solutions [Member]
Income Taxes [Line Items]
Net discrete tax (benefits) expense related to tax settlements				$ (36)