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Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Before Tax	$ (49)	$ 97	$ 69
Other comprehensive income (loss), Income Tax	5	(36)	(24)
Total Other Comprehensive Income (Loss), Net of Taxes	(44)	61	45
Derivatives accounted for as cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(20)	(3)	(1)
Other Comprehensive Income (Loss), before Reclassifications, Tax	5	1	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(15)	(2)	(1)
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	0	0	0
Reclassification from AOCI, Current Period, Tax	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax	0	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	12	4	(1)
Reclassification from AOCI, Current Period, Tax	(4)	(2)	1
Reclassification from Accumulated Other Comprehensive Income, Net of Tax	8	2	0
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(2)	(1)	(1)
Other Comprehensive Income (Loss), before Reclassifications, Tax	1	0	1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1)	(1)	0
Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(38)	6	5
Other Comprehensive Income (Loss), before Reclassifications, Tax	2	0	(1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(36)	6	4
Currency Translation [Member] | Cost of Sales [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	7	0	0
Reclassification from AOCI, Current Period, Tax	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Net of Tax	7	0	0
Postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Before Tax	(8)	91	67
Other comprehensive income (loss), Income Tax	1	(35)	(25)
Total Other Comprehensive Income (Loss), Net of Taxes	$ (7)	$ 56	$ 42

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