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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Income (Expense), Net
External services	$ 4	$ 2
Interest income	3	5
Gains (losses) on investments	9	5
Miscellaneous	(1)	0
Total other income (expense), net	$ 15	$ 12

X

- Definition

Component of Other Income (Expense) [Line Items]

+ References

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- Definition

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

+ References

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- Definition

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

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- Definition

The net amount of nonoperating interest income (expense).

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- Definition

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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