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Acquisitions and Dispositions Preliminary Fair Value of Assets Acquired and Liabilities Assumes at Acquisition Date (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Goodwill, Purchase Accounting Adjustments $ (66) $ 2  
Goodwill $ 10,844 $ 9,739 $ 9,324