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Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Contingency [Line Items]
Tax benefit related to federal research and development credits	$ 8	$ 0	$ 0
Uncertain tax positions	7	(3)	0
Change in tax rates	0	1	10
Impact of GILTI and FDII	4	6	4
Reinvested earnings at foreign subsidiaries	386
Accrued interest and penalties	2	4
Uncertain income tax position not recognized	14	7
Decrease in uncertain tax positions resulting from ongoing audits and settlements	4
France Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforward	30
Spain Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforward	18
Foreign Tax Authority
Income Tax Contingency [Line Items]
Release of valuation allowance		$ 8	6
Change in tax rates			$ 10
Domestic Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforward	0
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward	$ 23

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations attributable to deduction. Includes, but is not limited to, dividend deduction, deduction for dividend paid to employee stock ownership plan (ESOP), Medicare prescription drug benefit subsidy deduction, and other deductions.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Effective Income Tax Rate Reconciliation, Global Intangible Low Taxed Income And Foreign Derived Intangible Income, Amount

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