Equity (Schedule of Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Class of Stock [Line Items]
Dollars	$ 207	$ 252	$ 427
Class A [Member]
Class of Stock [Line Items]
Shares	2.5	3.7	5.9
Dollars	$ 207	$ 252	$ 427
Share Repurchase Program [Member] \| Class A [Member]
Class of Stock [Line Items]
Shares	1.8	2.3	4.9
Dollars	$ 150	$ 150	$ 350
To fund certain obligations under equity compensation plans [Member] \| Class A [Member]
Class of Stock [Line Items]
Shares	0.7	1.4	1.0
Dollars	$ 57	$ 102	$ 77

Number of shares that have been repurchased during the period and are being held in treasury.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration