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Goodwill and Intangible Assets - Schedule of Intangible Assets with Finite Lives (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value, finite lives | $ 101 | $ 95
Accumulated Amortization | (41) | (32)
Net Intangible Assets, finite lives | 60 | 63
Developed Technologies [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Value, finite lives | 34 | 34
Accumulated Amortization | (10) | (8)
Net Intangible Assets, finite lives | 24 | 26
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 | 65 | 59
Accumulated Amortization | (30) | (23)
Net Intangible Assets, finite lives | $ 35 | $ 36

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