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Intangible Assets and Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 15,656 $ 15,194
Goodwill from acquisitions, net of adjustments 48 643
Foreign currency translation 206 (181)
Goodwill, end of period $ 15,910 $ 15,656