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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 33 $ 27 $ 34
Charged to Costs and Expenses 10 10 1
Charged to Other Accounts 0 0 0
(Deductions) (9) (4) (8)
Balance at End of Period 34 33 27
Inventory Lower of Cost or Market Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 39 58 7
Charged to Costs and Expenses 5 70 99
Charged to Other Accounts 0 0 0
(Deductions) (41) (89) (48)
Balance at End of Period 3 39 58
Valuation Allowance on Deferred Tax Assets [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 72 68 51
Charged to Costs and Expenses 4 10 21
Charged to Other Accounts 0 0 0
(Deductions) (1) (6) (4)
Balance at End of Period $ 75 $ 72 $ 68