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Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Other Comprehensive Income Loss [Line Items]      
Other comprehensive income (loss), Before Tax $ 97 $ 69 $ 64
Other comprehensive income (loss), Income Tax (36) (24) (7)
Total Other Comprehensive Income (Loss), Net of Taxes 61 45 57
Derivatives accounted for as cash flow hedges      
Other Comprehensive Income Loss [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (3) (1) (4)
Other Comprehensive Income (Loss), before Reclassifications, Tax 1 0 2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (2) (1) (2)
Derivatives accounted for as cash flow hedges | Cost of Sales [Member]      
Other Comprehensive Income Loss [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 4 (1) 7
Reclassification from AOCI, Current Period, Tax (2) 1 (3)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 2 0 4
Investments [Member]      
Other Comprehensive Income Loss [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax (1) (1) 21
Other Comprehensive Income (Loss), before Reclassifications, Tax 0 1 (9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1) 0 12
Investments [Member] | Other Nonoperating Income (Expense) [Member]      
Other Comprehensive Income Loss [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 (21)
Reclassification from AOCI, Current Period, Tax 0 0 8
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 0 0 (13)
Currency Translation [Member]      
Other Comprehensive Income Loss [Line Items]      
Other Comprehensive Income (Loss), before Reclassifications, before Tax 6 5 (86)
Other Comprehensive Income (Loss), before Reclassifications, Tax 0 (1) 15
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6 4 (71)
Currency Translation [Member] | Cost of Sales [Member]      
Other Comprehensive Income Loss [Line Items]      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 115 [1]
Reclassification from AOCI, Current Period, Tax 0 0 (8) [1]
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 0 0 107 [1]
Postretirement benefits      
Other Comprehensive Income Loss [Line Items]      
Other comprehensive income (loss), Before Tax 91 67 32
Other comprehensive income (loss), Income Tax (35) (25) (12)
Total Other Comprehensive Income (Loss), Net of Taxes $ 56 $ 42 $ 20
[1] Translation loss reclassified to Cost of Sales related to disposition of a foreign operation, which is further described in Note 3: Acquisitions and Dispositions.