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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
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