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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 19 $ 34 $ 33
Charged to Costs and Expenses 4 3 10
Charged to Other Accounts 0 0 0
(Deductions) (2) (18) (9)
Balance at End of Period 21 19 34
Inventory Lower of Cost or Market Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 25 3 39
Charged to Costs and Expenses 61 68 5
Charged to Other Accounts 0 0 0
(Deductions) (52) (46) (41)
Balance at End of Period 34 25 3
Valuation Allowance on Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 79 75 72
Charged to Costs and Expenses 13 12 4
Charged to Other Accounts 6 0 0
(Deductions) (12) (8) (1)
Balance at End of Period $ 86 $ 79 $ 75