Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Apr. 03, 2021	Oct. 03, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 1,184	$ 1,057
Other Liabilities	(351)	(294)
Total	654	1,209
Fair value of borrowings	61,127	64,818
Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	202	515
Derivative Liabilities	(421)	(4)
Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	651	505
Derivative Liabilities	(620)	(549)
Other Derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	10	1
Derivative Liabilities	(1)	(22)
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	1,184	0
Other Liabilities	0	0
Total	1,184	0
Fair value of borrowings	0	0
Level 1 \| Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Derivative Liabilities	0	0
Level 1 \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Derivative Liabilities	0	0
Level 1 \| Other Derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Derivative Liabilities	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	1,057
Other Liabilities	(351)	(294)
Total	(530)	1,209
Fair value of borrowings	59,729	63,370
Level 2 \| Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	202	515
Derivative Liabilities	(421)	(4)
Level 2 \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	651	505
Derivative Liabilities	(620)	(549)
Level 2 \| Other Derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	10	1
Derivative Liabilities	(1)	(22)
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	0
Other Liabilities	0	0
Total	0	0
Fair value of borrowings	1,398	1,448
Level 3 \| Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Derivative Liabilities	0	0
Level 3 \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Derivative Liabilities	0	0
Level 3 \| Other Derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Derivative Liabilities	$ 0	$ 0

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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Fair value of asset after deduction of liability.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Fair value portion of other liabilities.

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