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Acquisitions And Divestitures Schedule of Purchase Price of Prior Year Acquisitions Allocated to Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Goodwill $ 6,536 $ 6,455 $ 5,316
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