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Income Taxes - Consolidated Income (Loss) Before Income Taxes and Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
Income before income taxes and noncontrolling interests	$ (429)	$ 2	$ (1,121)
Foreign tax authority | Ireland
Income Tax Contingency [Line Items]
Income before income taxes and noncontrolling interests	(3)	(1)	4
Foreign tax authority | Other Foreign
Income Tax Contingency [Line Items]
Income before income taxes and noncontrolling interests	(315)	173	(801)
United States
Income Tax Contingency [Line Items]
Income before income taxes and noncontrolling interests	$ (111)	$ (170)	$ (324)

X

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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