Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Reserves for environmental liabilities	$ 6	$ 8

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant