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Derivative Financial Instruments (Pretax Impact Of Fair Value Hedge Derivative Instruments On The Consolidated Statements of Income) (Details) - Fair Value Hedging [Member] - Cost of Sales [Member] - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Future [Member]      
Derivative [Line Items]      
Gain/(Loss) on forwards $ 42 $ 12 $ (20)
Forward Contracts [Member]      
Derivative [Line Items]      
Gain/(Loss) on forwards $ (42) $ (12) $ 20