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Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Other Comprehensive Income Loss [Line Items]    
Total Other Comprehensive Income (Loss), Before Tax $ (8) $ 1
Total Other Comprehensive Income (Loss), Tax 5 1
Total Other Comprehensive Income (Loss), Net of Taxes (3) 2
Derivatives accounted for as cash flow hedges:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax (20) (2)
Other Comprehensive Income (Loss), Before Reclassifications, Tax 6 1
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax (14) (1)
Derivatives accounted for as cash flow hedges: | Interest Expense [Member]    
Other Comprehensive Income Loss [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Before Tax 0 0
Reclassification from AOCI, Current Period, Tax 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 0 0
Derivatives accounted for as cash flow hedges: | Cost of Sales    
Other Comprehensive Income Loss [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Before Tax 7 1
Reclassification from AOCI, Current Period, Tax (2) (1)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 5 0
Investments:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 1 (1)
Other Comprehensive Income (Loss), Before Reclassifications, Tax 0 1
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 1 0
Currency translation:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 9 1
Other Comprehensive Income (Loss), Before Reclassifications, Tax (1) 0
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 8 1
Postretirement benefits    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax (28) 2
Other Comprehensive Income (Loss), Before Reclassifications, Tax 8 0
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax (20) 2
Postretirement benefits | Other income/expense    
Other Comprehensive Income Loss [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Before Tax 23 0
Reclassification from AOCI, Current Period, Tax (6) 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax $ 17 $ 0