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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Statement of Cash Flows [Abstract] |  |
Purchase accounting amortization | $ 1 | $ 1

X
- Definition Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration