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Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Parenthetical) (Details) $ in Millions	9 Months Ended
	Jun. 30, 2020 USD ($)
Segment Reporting [Abstract]
Accelerated depreciation	$ 39

X

- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration