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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 34 $ 33 $ 27
Charged to Costs and Expenses 3 10 10
Charged to Other Accounts 0 0 0
(Deductions) (18) (9) (4)
Balance at End of Period 19 34 33
Inventory Lower of Cost or Market Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 3 39 58
Charged to Costs and Expenses 68 5 70
Charged to Other Accounts 0 0 0
(Deductions) (46) (41) (89)
Balance at End of Period 25 3 39
Valuation Allowance on Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 75 72 68
Charged to Costs and Expenses 12 4 10
Charged to Other Accounts 0 0 0
(Deductions) (8) (1) (6)
Balance at End of Period $ 79 $ 75 $ 72