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Goodwill and Intangible Assets - Schedule of Intangible Assets with Finite Lives (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value, finite lives | $ 96 | $ 101
Accumulated Amortization | (43) | (41)
Net Intangible Assets, finite lives | 53 | 60
Developed Technologies [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value, finite lives | 34 | 34
Accumulated Amortization | (12) | (10)
Net Intangible Assets, finite lives | 22 | 24
Trademarks [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value, finite lives | 2 | 2
Accumulated Amortization | (1) | (1)
Net Intangible Assets, finite lives | 1 | 1
Customer Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value, finite lives | 60 | 65
Accumulated Amortization | (30) | (30)
Net Intangible Assets, finite lives | $ 30 | $ 35

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