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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Short-Term Debt, Gross [Line Items]
Short-term Borrowings Gross	$ 0	$ 1,168
Weighted average interest rate - discount notes	0.00%	4.76%
Foreign Currency Transaction Gain (Loss), Unrealized	$ 59	$ 62

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

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