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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Other Income (Expense), Net
Interest income	$ 34	$ 15	$ 12
External services	15	16	13
Gain (Loss) on Investments	13	(17)	16
Miscellaneous	(1)	(7)	0
Other income (expense), net	61	7	13
Sale of Bellefonte	$ 0	$ 0	$ (28)

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Component of Other Income (Expense) [Line Items]

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Revenue and expenses from external services included in Other income (expense), net on the Consolidated Statements of Operations.

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- Definition

Sale of Bellefonte

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- Definition

Amount of realized and unrealized gain (loss) on investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
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The net amount of nonoperating interest income (expense).

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Amount of expense related to nonoperating activities, classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
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-Section S99
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Amount of income (expense) related to nonoperating activities, classified as other.

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