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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. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings $ (13) $ (18) $ 16
Commodity Contracts [Member] | Sales [Member]      
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings (23) 18 111
Commodity Contracts [Member] | Cost of Sales [Member]      
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings 2 (33) (95)
Foreign Currency [Member] | Other Nonoperating Income (Expense) [Member]      
Derivative [Line Items]      
Gain/(Loss) Recognized in Earnings $ 8 $ (3) $ 0