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Product Warranties - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Other Current Liabilities [Member]    
Product Warranty Liability [Line Items]    
Short-term product warranties $ 18 $ 14
Other Noncurrent Liabilities [Member]    
Product Warranty Liability [Line Items]    
Long-term product warranties $ 7 $ 8