Financial Instruments and Fair Value Measurements, Assets Measured at Fair Value on Non-Recurring Basis (Details) $ in Millions	12 Months Ended
Sep. 30, 2017 USD ($) ReportingUnit	Oct. 01, 2016 USD ($)	Sep. 26, 2015 USD ($)	Oct. 01, 2011 USD ($)
Impairment [Abstract]
Indefinite-lived trademarks	$ 0	$ 0	$ 0
Goodwill	0	0	0	$ 165
Definite lived intangible assets	0	0	0
Property, plant, and equipment	2	3	2
Impairment charges	$ 2	3	2
Number of reporting units \| ReportingUnit	7
Fair Value on Nonrecurring Basis [Member]
Fair Value of Assets [Abstract]
Indefinite-lived trademarks	$ 248	248	207
Goodwill	2,775	2,406	1,652
Definite lived intangible assets	1,038	952	486
Property, plant, and equipment	2,366	2,224	1,294
Total	6,427	5,830	3,639
Fair Value on Nonrecurring Basis [Member] \| Level 1 [Member]
Fair Value of Assets [Abstract]
Indefinite-lived trademarks	0	0	0
Goodwill	0	0	0
Definite lived intangible assets	0	0	0
Property, plant, and equipment	0	0	0
Total	0	0	0
Fair Value on Nonrecurring Basis [Member] \| Level 2 [Member]
Fair Value of Assets [Abstract]
Indefinite-lived trademarks	0	0	0
Goodwill	0	0	0
Definite lived intangible assets	0	0	0
Property, plant, and equipment	0	0	0
Total	0	0	0
Fair Value on Nonrecurring Basis [Member] \| Level 3 [Member]
Fair Value of Assets [Abstract]
Indefinite-lived trademarks	248	248	207
Goodwill	2,775	2,406	1,652
Definite lived intangible assets	1,038	952	486
Property, plant, and equipment	2,366	2,224	1,294
Total	$ 6,427	$ 5,830	$ 3,639

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 4
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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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