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Debt and Financing Arrangements - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Long-term debt	$ 8,568,000,000	$ 8,462,000,000
Interest paid	361,000,000	$ 288,000,000	$ 222,000,000
$2.5 Billion Facility Expiring Dec 2024
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	2,500,000,000
$500 million facility expiring Nov 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	500,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0

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