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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 21 $ 19 $ 34
Charged to Costs and Expenses 9 4 3
Charged to Other Accounts 0 0 0
(Deductions) (4) (2) (18)
Balance at End of Period 26 21 19
Inventory Lower of Cost or Market Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 34 25 3
Charged to Costs and Expenses 102 61 68
Charged to Other Accounts 0 0 0
(Deductions) (109) (52) (46)
Balance at End of Period 27 34 25
Valuation Allowance on Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 86 79 75
Charged to Costs and Expenses 35 13 12
Charged to Other Accounts 13 6 0
(Deductions) (7) (12) (8)
Balance at End of Period $ 127 $ 86 $ 79