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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Other Income (Expense), Net
External services	$ 9	$ 4
Interest income	10	10
Gains (losses) on investments	(2)	9
Other income (expense), net	$ 17	$ 23

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Component of Other Income (Expense) [Line Items]

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- Definition

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

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

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Amount of interest income (expense) classified as nonoperating.

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

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