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Derivative Financial Instruments (Pretax Impact Of Undesignated Derivative Instruments On The Consolidated Statements Of Income) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings $ 16 $ (54) $ (99)
Commodity Contracts [Member] | Sales [Member]      
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings 111 (73) (62)
Commodity Contracts [Member] | Cost of Sales [Member]      
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings (95) 17 (33)
Foreign Currency [Member] | Other Nonoperating Income (Expense) [Member]      
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings $ 0 $ 2 $ (4)