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Debt - Fiscal 2023 Transactions (Details) - USD ($) $ in Millions				12 Months Ended
	Jun. 30, 2023	Jan. 27, 2023	Nov. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 4	$ 0	$ 22
Senior Term Loan Facility | Acquisition Corp.
Debt Instrument [Line Items]
Line of credit facility, increase (decrease), net			$ 150
Line of credit facility, maximum borrowing capacity	$ 1,295		$ 1,295
Repayments of secured debt	$ 150
Loss on extinguishment of debt				4
Term Loan Mortgage
Debt Instrument [Line Items]
Repayments of secured debt				$ 1	$ 0	$ 0
Term Loan Mortgage | Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 19
Term Loan Mortgage | Acquisition Corp. | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (as a percent)		1.40%

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