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Derivative Financial Instruments (Pretax Impact Of Undesignated Derivative Instruments On The Consolidated Statements Of Income) (Details) - Undesignated - USD ($)
$ in Millions
3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Gain/(Loss) Recognized in Earnings $ (13) $ 50
Commodity contracts | Sales    
Derivative [Line Items]    
Gain/(Loss) Recognized in Earnings 9 51
Commodity contracts | Cost of Sales    
Derivative [Line Items]    
Gain/(Loss) Recognized in Earnings (22) (1)
Foreign exchange contracts | Other income/expense    
Derivative [Line Items]    
Gain/(Loss) Recognized in Earnings $ 0 $ 0