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Divestitures - Summary of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019
Divestitures [Abstract]
Accounts receivable, net	$ 4	$ 5
Inventories	3	3
Net property, plant and equipment	34	34
Goodwill	14	14
Other assets	5	3
Current assets held for sale	60	59
Trade and other payables	5	6
Accrued expenses and other liabilities	1	1
Current liabilities held for sale	$ 6	$ 7

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