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Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Parenthetical) (Details) $ in Millions | 9 Months Ended
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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