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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income (Expense), Net
External services	$ 3	$ 3	$ 10	$ 9
Interest income	3	3	9	14
Gains (losses) on investments	5	10	16	4
Miscellaneous	0	0	2	0
Other income (expense), net	$ 11	$ 16	$ 37	$ 27

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Component of Other Income (Expense) [Line Items]

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

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