Financial Instruments and Fair Value Measurements, Effect of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Derivative Instruments [Abstract]
Amortization related to unrealized losses in Accumulated other comprehensive loss for next 12 months	$ (5)
Fair value of long-term indebtedness greater/(less) than book value	26	$ 77
Cross-Currency Swaps [Member] \| Interest Expense, Net [Member] \| Designated [Member]
Derivative Instruments [Abstract]
Loss (gain) on derivative instruments	(25)	(19)	$ (5)
Cross-Currency Swaps [Member] \| Other Expense, Net [Member] \| Not Designated [Member]
Derivative Instruments [Abstract]
Loss (gain) on derivative instruments	0	41	0
Foreign Exchange Forward Contracts [Member] \| Other Expense, Net [Member]
Derivative Instruments [Abstract]
Loss (gain) on derivative instruments	0	99	0
Interest Rate Swaps [Member] \| Interest Expense, Net [Member]
Derivative Instruments [Abstract]
Loss (gain) on derivative instruments	$ 32	$ 2	$ (1)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80845-113994

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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