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Intangible Assets and Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Goodwill [Roll Forward]    
Balance as of beginning of period $ 17,787 $ 15,958
Goodwill from acquisitions, net of adjustments 0 2,320
Foreign currency translation 210 (491)
Balance as of end of period $ 17,997 $ 17,787