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Litigation, Claims and Contingencies - Summary of Reconciliation of Changes in Environmental Remediation Reserves (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Environmental Remediation Obligations [Abstract]
Reserve - beginning of period	$ 186	$ 187
Disbursements	(28)	(23)
Revised obligation estimates and accretion	40	28
Reserve - end of period	$ 198	$ 192

X

- Definition

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

+ References

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-Name Accounting Standards Codification
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- Definition

Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

+ References

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- Definition

Amount of cash outflow to settle environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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