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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 31 $ 35 $ 30
Charged to Costs and Expenses 3 4 9
Acquisitions & Purchase Price Adjustments 0 0 0
Deductions from Reserve (2) (8) (4)
Balance at End of Period 32 31 35
Reserve for excess and obsolete inventory      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 209 196 194
Charged to Costs and Expenses 35 20 21
Acquisitions & Purchase Price Adjustments 11 0 3
Deductions from Reserve (19) (7) (22)
Balance at End of Period 236 209 196
Valuation Allowance of Deferred Tax Assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 227 137 74
Charged to Costs and Expenses 91 90 62
Acquisitions & Purchase Price Adjustments 0 0 1
Deductions from Reserve 0 0 0
Balance at End of Period $ 318 $ 227 $ 137