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Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Contingency [Line Items]
Tax benefit of impairment and held for sale	$ 37
Tax benefit of change in permanent reinvestment assertion	14
Deferred tax assets	38
Valuation allowance	24
Return to provision adjustments	5	$ 15	$ (4)
Tax benefit related to federal research and development credits	2	3	8
Uncertain tax positions	2	(3)	7
Reinvested earnings at foreign subsidiaries	1,000
Accrued interest and penalties	2	1
Uncertain income tax position not recognized	14	$ 11
Decrease in unrecognized tax benefits is reasonably possible	2
France Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforward	1
His Majesty's Revenue and Customs (HMRC)
Income Tax Contingency [Line Items]
Net operating loss carryforward	4
Foreign Tax Jurisdiction
Income Tax Contingency [Line Items]
Tax benefit related to federal research and development credits			$ 8
Domestic Tax Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward	0
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward	$ 21

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