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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Other Income (Expense), Net
External services	$ 3	$ 3	$ 8	$ 7
Interest income	3	3	7	6
Gains (losses) on investments	(6)	2	(2)	11
Miscellaneous	3	3	4	2
Other income (expense), net	$ 3	$ 11	$ 17	$ 26

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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

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

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The net amount of nonoperating interest income (expense).

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

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

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