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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Other Income (Expense), Net
Interest income	$ 23	$ 23	$ 24
External services	14	14	12
Gains (losses) on investments	6	9	7
Miscellaneous		(10)	0
Miscellaneous	7
Total other income (expense), net	$ 50	$ 56	$ 43

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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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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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