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Other Income And Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Components of Other Income and Expenses [Line Items]    
Proceeds from Sale of Other Investments $ 79  
Cost of Sales [Member] | One Time Cash Bonus [Member]    
Components of Other Income and Expenses [Line Items]    
Other Nonrecurring Expense   $ 109
Other Nonoperating Income (Expense) [Member]    
Components of Other Income and Expenses [Line Items]    
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 48  
Income (Loss) from Equity Method Investments 20 21
Foreign Currency Transaction Gain, before Tax   1
Gain on Sale of Investments $ 55  
Unusual or Infrequent Item, or Both, Insurance Proceeds   11
Revision of Prior Period, Adjustment [Member] | Accounting Standards Update 2017-07 [Member] | Other Nonoperating Income (Expense) [Member]    
Components of Other Income and Expenses [Line Items]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)   $ (23)