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Litigation, Claims and Contingencies - Summary of Components of Environmental Remediation Expense Included within Selling, General and Administrative Expense (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Environmental Expense And Liabilities [Abstract]
Net expense relates to divested businesses	$ 3	$ 1	$ 4	$ 3

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- Definition

Net expense related to divested businesses.

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No definition available.

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