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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Short-Term Debt, Gross [Line Items]
Short-Term Debt	$ 432	$ 1,172
Short-term Borrowings Gross	$ 432	$ 1,173
Weighted average interest rate - discount notes	5.29%	2.93%
Foreign Currency Transaction Gain (Loss), Unrealized	$ 109	$ 150

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[Line Items] for Short-Term Debt, Gross [Table]

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Short-term Borrowings Gross

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Amount, before tax, of unrealized gain (loss) from foreign currency transaction.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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