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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Related Party Transaction [Line Items]      
Net sales to related parties $ 14,688 $ 15,395 $ 14,121
Purchases from related parties 13,760 14,362 13,314
Accounts receivable due from related parties 1,896 1,874  
Accounts payable due to related parties 2,552 2,526  
Related Party      
Related Party Transaction [Line Items]      
Net sales to related parties 251 253 247
Purchases from related parties 399 397 $ 434
Accounts receivable due from related parties 28 26  
Accounts payable due to related parties $ 114 $ 67