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Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), Before Tax $ (131) $ (49) $ 97
Other comprehensive income (loss), Income Tax 29 5 (36)
Total Other Comprehensive Income (Loss), Net of Taxes (102) (44) 61
Derivatives accounted for as cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (39) (20) (3)
Other Comprehensive Income (Loss), before Reclassifications, Tax 10 5 1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (29) (15) (2)
Derivatives accounted for as cash flow hedges | Interest Expense [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1 0 0
Reclassification from AOCI, Current Period, Tax 0 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 1 0 0
Derivatives accounted for as cash flow hedges | Cost of Sales [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 18 12 4
Reclassification from AOCI, Current Period, Tax (5) (4) (2)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 13 8 2
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 3 (2) (1)
Other Comprehensive Income (Loss), before Reclassifications, Tax (1) 1 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 2 (1) (1)
Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (23) (38) 6
Other Comprehensive Income (Loss), before Reclassifications, Tax 0 2 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (23) (36) 6
Currency Translation [Member] | Cost of Sales [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 7 0
Reclassification from AOCI, Current Period, Tax 0 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 0 7 0
Postretirement benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (114) (8) 91
Other Comprehensive Income (Loss), before Reclassifications, Tax 31 1 (35)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (83) (7)  
Total Other Comprehensive Income (Loss), Net of Taxes     56
Postretirement benefits | Other Nonoperating Income (Expense) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 23 0 0
Reclassification from AOCI, Current Period, Tax (6) 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax $ 17 $ 0 $ 0