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Divestitures - Summary of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	Jun. 30, 2020	Sep. 30, 2019
Divestitures [Abstract]
Accounts receivable, net	$ 6	$ 5
Inventories	2	3
Net property, plant and equipment	34	34
Goodwill	14	14
Other assets	5	3
Current assets held for sale	61	59
Trade and other payables	4	6
Accrued expenses and other liabilities	1	1
Current liabilities held for sale	$ 5	$ 7

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