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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other Income (Expense), Net
Increase (Decrease) in Other Income (Expense)	$ 12
Deposit Liabilities, Description	21	0
External services	$ 3	$ 4
Interest income	6	6
Gains (losses) on investments	(7)	2
Miscellaneous	1	0
Total other income (expense), net	$ 24	$ 12

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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

Period increase (decrease) related to the Other Income line item.

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- Definition

Description of the deposits held by the entity, which may include a description of the types and repayment terms of the deposits, the accounting policy for the deposits and the amount of the liabilities recognized for the deposits.

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

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