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Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Other Comprehensive Income Loss [Line Items]    
Total Other Comprehensive Income (Loss), Before Tax $ 38 $ (8)
Total Other Comprehensive Income (Loss), Tax 0 5
Total Other Comprehensive Income (Loss), Net of Taxes 38 (3)
Derivatives accounted for as cash flow hedges:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 0 (20)
Other Comprehensive Income (Loss), Before Reclassifications, Tax 0 6
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 0 (14)
Derivatives accounted for as cash flow hedges: | Interest Expense [Member]    
Other Comprehensive Income Loss [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Before Tax 1 0
Reclassification from AOCI, Current Period, Tax 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 1 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 2 7
Reclassification from AOCI, Current Period, Tax 0 (2)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 2 5
Investments:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 0 1
Other Comprehensive Income (Loss), Before Reclassifications, Tax 0 0
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 0 1
Currency translation:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 35 9
Other Comprehensive Income (Loss), Before Reclassifications, Tax 0 (1)
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 35 8
Currency translation: | Cost of Sales    
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
Postretirement benefits:    
Other Comprehensive Income Loss [Line Items]    
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 0 (28)
Other Comprehensive Income (Loss), Before Reclassifications, Tax 0 8
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 0 (20)
Postretirement benefits: | Other income/expense    
Other Comprehensive Income Loss [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Before Tax 0 23
Reclassification from AOCI, Current Period, Tax 0 (6)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax $ 0 $ 17