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Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2026	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2019	Sep. 30, 2018
Short-Term Debt, Gross [Line Items]
Short-term debt, net of discounts	$ 57	$ 0	$ 0	$ 0	$ 0	$ 0	$ 922	$ 1,217
Short-term Borrowings Gross	$ 57
Weighted average interest rate - discount notes	0.06%						2.15%	2.05%
Foreign Currency Transaction Gain (Loss), Unrealized	$ 153
Foreign Currency Transaction Gain, before Tax	$ 73

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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 foreign currency transaction realized and unrealized gain recognized in the income statement.

+ References

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-Publisher FASB
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-SubTopic 20
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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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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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