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Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), Before Tax $ (72) $ (131) $ (49)
Other comprehensive income (loss), Income Tax 10 29 5
Total Other Comprehensive Income (Loss), Net of Taxes (62) (102) (44)
Derivatives accounted for as cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (17) (39) (20)
Other Comprehensive Income (Loss), before Reclassifications, Tax 5 10 5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (12) (29) (15)
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 6 1 0
Reclassification from AOCI, Current Period, Tax (2) 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 4 1 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 24 18 12
Reclassification from AOCI, Current Period, Tax (7) (5) (4)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 17 13 8
Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1 3 (2)
Other Comprehensive Income (Loss), before Reclassifications, Tax 0 (1) 1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1 2 (1)
Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (29) (23) (38)
Other Comprehensive Income (Loss), before Reclassifications, Tax 0 0 2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (29) (23) (36)
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 0 7
Reclassification from AOCI, Current Period, Tax 0 0 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 0 0 7
Postretirement benefits      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1 (114) (8)
Other Comprehensive Income (Loss), before Reclassifications, Tax 0 31 1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1 (83)  
Total Other Comprehensive Income (Loss), Net of Taxes     (7)
Postretirement benefits | Other Nonoperating Income (Expense) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (58) 23 0
Reclassification from AOCI, Current Period, Tax 14 (6) 0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax $ (44) $ 17 $ 0