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Acquisitions And Divestitures Schedule of Purchase Price of Prior Year Acquisitions Allocated to Assets and Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]      
Goodwill $ 6,734 $ 6,536 $ 6,455
Purchases of businesses, net of cash acquired $ 126 $ 469 2,203
Total acquired businesses      
Business Acquisition [Line Items]      
Accounts receivable     153
Inventory     187
Property, plant and equipment     140
Goodwill     1,176
Intangibles     1,013
Other assets     77
Total assets     2,746
Accounts payable     73
Other current liabilities     134
Deferred taxes and other liabilities     325
Cash paid, net of cash acquired     $ 2,214